Jim Perkins Tribute: R.I.P. Corvette Corporate Angel

Published on June 23, 2020June 23, 2020 by Scott

Jim Perkins: The Man That Saved the Modern Corvette

(Note: this story was originally published in the March 2019 issue of Vette Vues Magazine) – The Corvette is the most unlikely of all cars for a company such as General Motors to produce. GM is all about producing huge volumes of cars and trucks. When the Corvette came out as a late offering in June 1953, only 300 cars were hand-assembled. Engineers and builders were literally designing as they were building the cars. Sales jumped to 3,640 for 1954 and tanked to just 700 in 1955. Harley Earl restyled the Corvette for 1956 and sales went up to 3,467 units and then 6,339 for 1957. Meanwhile Ford sold 16,155 T-Birds in 1955, 15,631 in 1956, and 21,380 in 1957! They were killing the Corvette then went to a four-seater configuration, leaving Chevrolet the two-seater sports car market all to themselves. Corvette sales didn’t hit 10,000 units until 1960; not much in the big picture of GM!

The long knives were out for the Corvette inside GM. There were many that didn’t understand the Corvette, didn’t like it, and wanted it dead! What saved the Corvette were its corporate angels; Art and Color Section VP, Harley Earl; Chevrolet general manager, Ed Cole; Senior VP of Design, Bill Mitchell; Zora Arkus-Duntov; and Mauri Rose. The common denominator with all of these men is that they are “car guys”. Bill Mitchell was famous for boasting, “I’ve got gasoline in my veins!” Aside from Duntov and Rose, these men had corporate clout; they could lean on and make things happen.

Photo Credit: Motor Trend Magazine
While general manager of Chevrolet, Jim Perkins was famous for handing out pins with the Chevy bow-tie and the work “Pride” beneath it.

In 1960, after some college attendance at Baylor University and three years in the Navy, Jim Perkins took a job at a Chevrolet warehouse, sorting parts while he finished his degree. Little did Perkins know that thirty years later, he too would become a corporate angel for the Corvette.

Perkins was a Depression Era kid from Waco, Texas. When World War II broke out Perkins’ dad tried to enlist in the military but was told he was “too old”. This was a time when men did whatever they had to do to put food on the table. Being mechanically inclined, Perkins’ dad started fixing cars, then buying, and selling cars. Perkins spent a lot of time with his dad and at the age of 14, he got an after school job at a local Texaco service station. Perkins quickly developed a reputation as a very good Chevy mechanic. Perkins fixed and sold a series of cars and finally got a hot ’52 Oldsmobile. But when the ’55 Chevy came out, he sold his Olds and made enough for a new Chevy. From here forward, Perkins was a Chevy car guy!

After graduating from high school, Perkins took courses at Baylor then served three years in the Navy. After his discharge from the Navy, he took a low-level job, sorting parts at a Chevrolet warehouse, while completing his college courses. With his Navy experience and eventual degree, Perkins quickly rose through the ranks at Chevrolet in Sales & Service. In the mid-‘70s, he landed a peach-of-a-job working for then GM president, Pete Estes. That’s where Perkins learned the ropes of GM corporate life.

After a few years working for Estes, Perkins was transferred to Buick. Detroit was struggling to come out of the 1970s recession and how to deal with the success of Japanese cars. Perkins was working under Lloyd Reuss and it was a good relationship. “Just In Time” production was a new concept and Perkins was doing many of the management tasks that Lloyd normally would have done, and he loved it! The first two years they set records; then management changed.

The new top guy at Buick was Don Hackworth and it wasn’t a good mix for Perkins. The two men almost immediately started butting heads. On a plane coming back from a business meeting, Perkins asked Hackworth what they could do to have a better working relationship. Hackworth suggested a “foreign assignment” for Perkins. That was IT for Perkins. What Hackworth didn’t know was that Toyota was wooing Perkins for an executive position. The timing was perfect

Photo Credit: Motor Trend Magazine
Right to Left: Jim Perkins, General Chuck Yeager and AJ Foyt

When Perkins came into Toyota with his “GM top-down” management style, he was nearly stopped in his tracks. The Japanese car companies were all using the “Consensus Process”; which starts from the bottom (assembly workers) and goes up from there. Perkins quickly learned that while the process takes longer, the execution is like a rocket ship; everyone is onboard and you get better solutions.

A year later, Toyota made Perkins Group V.P. for Sales, Marketing, Distribution, Product Planning, and New Ventures. Around this time Japanese car companies announced that they were taking on the luxury car segment of Mercedes and BMW. Mr. Toyoda wanted to prove to the world that they could build world-class luxury automobiles. Toyota formed Lexus and Perkins was a key player.

Then, an extraordinary thing happened; GM wanted Perkins back! Typically at GM, once you leave, that’s it. Perkins learned from his former boss, Lloyd Reuss, that then-GM president Bob Stemple (another car guy!) wanted to talk to Perkins about coming back. When the two men talked, Perkins told Stemple, “There are two jobs I would come back for; president of GM, or general manager of Chevrolet.” Stemple’s reply was, “Well, that’s a little lofty.” Stemple and Perkins continued their conversation for a time before Stemple called Perkins. “OK, big boy, it’s time to put up of shut up. We’ll make you general manager of Chevrolet.”

It had been twenty-nine years since car guy mechanic Jim Perkins started sorting parts in a Chevrolet warehouse. In May 1989 Perkins was made general manager of Chevrolet. He’s always been a Chevy-guy, and now he was running the division. But when Perkins got back, he was in for a shock. Perkins said in a 2014 interview with Motor Trend, “I didn’t recognize Chevrolet when I got back. It had lost its pride. There was so much infighting among sales, marketing, product planning, distribution, you name it. Everywhere you looked was a silo with its own management, and that’s the kiss of death.”

Photo Credit: DigitalCorvettes.com
The CERV IV was really a C5 in drag. Under the stretched body was a full C5 frame and suspension. This is the car that convinced GM management to go ahead with the C5.

“TCE” Total Customer Enthusiasm had to start at the top, meaning that managers with bad attitudes had to go. Using Toyota’s “Consensus Process” concept, Perkins invited his people to write to him about the problems they faced and possible solutions. Perkins got 1900 letters, read them all, distilled them into to-do lists, and formed employee councils to come up with working plans. A lot got fixed, workers felt their experience mattered and the organization was much happier. The same concept was also applied to the dealer networks.

By 1990 the nation’s economy was moving into another recession and things were not good inside GM. All car lines were being closely reviewed and Corvette sales were in a downward direction. Once again, the car was on the chopping block. According to Corvette designer, John Cafaro, by 1992 the Corvette almost died. People in the company didn’t understand the car and no one wanted to champion the car. Former GM executive Ralph Kramer said, “Many GM insiders considered the Corvette to be a non-essential product in the GM/Chevrolet stable. The thought that the Corvette would NOT just be in the Chevy stable of cars, but instead the main character; the stud-horse; the Secretariat; was totally remote to the Corvette-haters; but how could it not be otherwise?” (Today, the Corvette is THE flagship of GM)

GM’s Mid-size Car Division managed Joe Spielman (also a car guy and Corvette fan) created a task group called, “The Decision Makers”. The group consisted of himself, Carlisle Davis, John Cafaro, and Dave McLellan. The team’s objective was to create a path for the future of the Corvette. They came up with three directions; First: A production version of the 1990 mid-engine CERV-III; Second: The Momentum Architecture, featuring an evolutionary body style, a stiff backbone-type chassis, and a transaxle; and Third: the “Stiffer and Lighter” design which was a lighter and improved C4. The team chose the “Momentum Architecture”. The problem was funding.

In November 1992 Dave Hill took over as Corvette’s chief engineer and had a big problem on his hands; how to prove the concept of the Momentum Architecture when he had no budget. Corvette manager Russ McLean went the Perkins and explained that the Corvette team needed funding for another CERV Corvette (Corporate Engineering Research Vehicle) to prove the viability of the Momentum Architecture concept. Perkins managed to pull $1.2 Million from another budget to allow Hill’s team to build what is arguably the stealthiest R&D Corvette ever, the CERV IV.

Photo Credit: Mecum Auctions
This is the 1995 Indy 500 Corvette Pace Car that Jim Perkins drove to start the 1995 Indy 500.

The CERV IV was essentially a C5 structure wearing a C4 body. A keen eye would have noticed that it looked like a “l-o-n-g” C4 Corvette, but when the car was on public roads, no one noticed. When Hill took executives for a ride, they all said, “This is like no Corvette we ever felt!” Hill proved to GM’s president, Jack Smith, that his team could reinvent the Corvette, as well as the building process. The $1.2 Million that corporate angel Perkins was able to secure for the CERV IV saved the Corvette! It was something that ONLY Jim Perkins could have done.

In 1996, at age 61, Perkins retired from Chevrolet. In his seven years as Chevrolet’s general manager he rekindled Chevy’s 1960’s-style pride; improved Chevy’s truck production; strengthened Chevy’s role in product development and design; helped his people come to grips with downsizing and reorganization, supervised the Chevrolet Racing Team that won five NASCAR Championships and had six Indy Car victories; and got to drive the pace car at the Indy 500 three times in 1990, 1993, and 1995 (in a Corvette).

Photo Credit: GM Archives
While it doesn’t look like it, the C5 is the most radical new production Corvette ever offered, thanks to its new hydro-formed perimeter frame, center spine structure, all-aluminum LS1 engine, and transaxle.

In the 2014 Motor Trend interview, Perkins said this about driving the Indy pace car, “You come out of turn four when you’re going to turn them loose, you know you have to make the left turn into the pits, you look down the track, and it looks like everything is closing in on you with all the people and color and movement. You swear you’re going through the eye of a needle. My God, it is such a tremendous, tremendous experience.”

Retirement from Chevrolet only lasted three months when Perkins accepted an offer from Rick Hendricks to take over his company after he came down with leukemia. Perkins stayed on as the CEO and later COO. Perkins said of his time at Hendricks Motorsports, “If ever anything has been rewarding, it has been seeing this company do what it has done. I have no regrets. It’s been a blast, a great, great, great ride.” In 1999 Jim Perkins was inducted into the National Corvette Museum’s Hall of Fame in the GM-Chevrolet Category.

Photo Credit: National Corvette Museum
Jim Perkins was inducted into the National Corvette Museum’s Hall of Fame in 1999.

Jim Perkins was a poor kid from depression-era Waco, Texas that liked to work on Chevys. He was described as a “wily, free-speaking, cowboy boot-wearing Texan.” Perkins died on December 28, 2019 in Charlotte, North Carolina. Jim Perkins was 83 years-of-age. Perkins had an exemplary career and most importantly to the Corvette community, saved the Corvette. – Scott

R.I.P. Vette Magazine 1976-2019

Published on February 25, 2020 by Scott

Dateline: 2.25.20 – On December 6, 2019 I received an email from Vette magazine editor Brian Brennan. The title of the email said it all; “Vette is Terminated”. I wasn’t surprised, as I’d been hearing rumblings that the magazine was on thin ice for well over ten years.

Just the same, it was a sad day for me. Instantly I was back in the summer of 1976 when one hot steamy day in southern New Jersey at my local newsstand at the Cherry Hill News Stop at the corner of Haddonfield Rd. and Chapel Avenue in Cherry Hill, New Jersey; I saw a new magazine that stopped me in my tracks. There among the rest of the familiar car magazines was a new title; “Vette Quarterly”.

I had been haunting the local magazine stands for car magazines since 1965 and I was always on the lookout for Corvette special editions, but this was better than any special edition I’d ever seen. Vette Quarterly was “Corvettes-only” and I wanted to be part of this new publication. My favorite car magazine then was “Hi-Performance CARS”; a great east coast publication filled with the kinds of cars I saw on the local street scene and at the Atco Raceway and Cecil County Drag-O-Way where I’d been working as one of the weekend track announcers since 1972.

The icing on the cake was when I saw that Martyn “Marty” L. Schorr was the editor of Vette Quarterly. I was very familiar with Marty’s writing and leadership as the editor of CARS, so I knew Vette Quarterly was going to something special.

I’d been drawing for several car magazines for two years, so I made copies of my best illustrations and wrote a letter asking if I could be a contributing illustrator for Vette Quarterly. A week later, I got a call from Marty. As soon as I heard Marty’s voice, his Big Apple accent told me who was on the phone. Marty said, “Scott, I got your samples, very nice. What would you like to do?” That was it, I was in!

What I didn’t know was that that was the beginning of a 43-year long relationship with the publication. Vette Quarterly went bi-monthly in a few years and then by the early 1980s was a full-fledged monthly, Corvette-only magazine and I was part of it.

In the early ’80s Marty moved on to start his successful marketing and PR business, “PMPR, Inc, Public Relations & Marketing Agency”. As the decades rolled on Vette magazine was sold and bought by numerous publishers and somehow I managed to stay on as a contributing artist and writer.

In the spring of 1997 I pitched then editor, Richard Lentinello a concept I called, “The Illustrated Corvette Series” as a monthly column. Lentinello liked the idea but didn’t have an open page for another columnist, so it was, “Thanks, but no thanks”. A week later Lentinello called me to ask if I still wanted to do a column, as one of his other columnists informed him that he could no longer do his column. Of course, I said, “Yes!” My plan was to cover every year Corvette in chronological order; so maybe I’d have 50 installments. When Vette magazine was shuttered last December I had completed 275 installments and got a book deal from Car-Tech Books in 2010.

So, when I learned that Vette magazine was finished it was a sad day, as I never dreamed that my association with that one specialty publication would last so long. Along the way, in addition to my monthly column, I did a lot of feature stories. All of my feature stories and many of my monthly columns were published on www.SuperChevy.com. To check them out,, just use the search tool at the top of SuperChevy.com’s website.

In 2008 Vette published an interview with Marty Schorr where he shared with our readers how he got into the magazine biz and how and why he launched Vette Quarterly. Then in 2016 I wrote “Happy 40^th Birthday Vette Magazine”.

Below are links to the two mentioned stories, as well as the transcript of when I interviewed Marty and Joel Rosen on my “Far Out Radio” show where they shared how they created their Baldwin-Motion Phase-III Supercars.

Will Vette magazine ever be resurrected? The paper publishing world is rapidly shrinking, even for mainstream magazines, so it is doubtful that we’ll ever see Vette magazine on the newsstands again. But, you know that old saying, “Never say never”. Anything could happen. We’ll see. – Scott

Marty Schorr interview for Vette magazine, Pt 1 – CLICK HERE.

Marty Schorr interview for Vette magazine, Pt 2 – CLICK HERE.

“Happy 40^th Birthday Vette magazine”, CLICK HERE.

“Marty Schorr & Joel Rosen Interview, Pt. 1, CLICK HERE.

“Marty Schorr & Joel Rosen Interview, Pt. 2, CLICK HERE.

Corvette Chassis History, Pt 6: The C7 Chassis Tadge Juechter Built

Published on January 20, 2020January 20, 2023 by Scott

Tagdge Juechter’s Genesis Program C7 Chassis

Dateline: 1-20-20, Illustrations & graphics by K. Scott Teeters – The C6 Corvette was a much-improved C5 and was well-received upon release. Fans liked the crisp new look, the new interior (for a while), and the extra grunt. Since the successful arrival of the performance Z06 model in 2001, every new generation Corvette is expected to have a Z06. Within minutes of the C6’s debut, the next question was, “Where’s the Z06?” The following year when the C6 Z06 was unleashed, there was an unanticipated surprise; an aluminum chassis.

This wasn’t on anyone’s wish list and was a total surprise. It wasn’t even on Zora Arkus-Duntov’s Christmas list! Weighing in at just 3,132-pounds, you have to go back to 1964 to find a lighter Corvette (3,125-pounds). Powered by the mighty 427 LS7 engine with 505 net-horsepower, with C5-R suspension technology, the C6 Z06 was better suited for the track, although many learned how to drive the new beast successfully on the street. The C6 Z06’s aluminum chassis had no trouble handling 638-horsepower in the ZR1 configuration. Bravo Corvette chassis engineers!

When Tadge Juechter’s C7 Corvette debuted, fans were stunned to learn that the base model C7 was built an even better version of the Z06’s aluminum chassis. But wait, there’s more! The same new aluminum chassis would be used for the coupe AND convertible Corvette. This was a major breakthrough and bespeaks of advanced engineering. Here’s how Juechter’s team did it.

Juechter’s objective was to build a modern performance car that delivered enhanced driving experience, more efficiency that yielded more performance. Every element had to contribute to the overall performance and there would be nothing fake. That explains everything that we see on the C7 Corvette, but what’s unseen is even more amazing.

As we learned from the C5 with its hydroformed side rails, stiffness matters. Juechter is on record stating that while hydroforming was an engineering game-changer, the downside is that parts have a uniform thickness; even in areas where it isn’t needed. Hydroformed parts cannot be tailored for areas that need greater or less strength. Enter the Genesis Software Program.

This is almost computer magic. Engineers first determine the overall block space they want; length, width, and height. Then they determine where they want to place the major components; engine, transmission, suspension assemblies, cabin parts, etc. This creates negative spaces where the structure needs to be to hold everything together. The Genesis Program then synthesizes an optimum structure so that engineers can then take the load design and break it down into parts that can be fabricated and joined together. Afterward, dynamic stress and crash testing is performed and parts modified to meet predetermined objectives.

The C7’s hydroformed aluminum frame rails were optimized for the best the aluminum industry could offer, in terms of tensile strength, lightweight, and materials-joining technology. New aluminum metallurgy and aluminum fastening technologies allow engineers to augment the hydroformed frame with 7000-Series aluminum extrusions designed for specific areas; such as engine/front suspension assembly, transaxle/rear suspension assembly mounting points and frontal collision areas.

Careful consideration to the placement of major components was also critical. Juechter’s team felt that the C6 was slightly nose-heavy. Components were adjusted so that the C7 is now rear-biased, allowing more load on the rear wheels for better traction at launch; like a racecar. The front wheels were moved forward 1-inch making the wheelbase 106.7-inches. This is the longest wheelbase Corvette ever made. The shortest was the C4, measuring 96.2-inches. Moving the wheels forward also allowed for more space under the hood for the new LT1 engine and various auxiliary systems. This also preserved “crash space” in the front.

Offering an aluminum frame for the coupe and convertible was a big challenge for the team. But because the basic frame structure is so strong, it didn’t need additional roof structure via a fixed roof. The net result is that not only can the Z06 and ZR1 have lift-off rood panels, but both can also be offered as a convertible. This was unimaginable for the C5 Z06, C6 Z06, and the C6 ZR1. According to Ed Moss, the C7 structural engineer group manager, his engineering team tailored sixteen different thicknesses of various grades of aluminum from 11-mm to 2-mm. The completed C7 aluminum frame is 100-pounds lighter than the C6’s steel frame and is 60-percent stiffer. Juechter said that engineers consider the C7’s aluminum chassis to be the most beautiful part of the C7. Perhaps someday Chevrolet will offer a transparent carbon fiber body option.

The C7 frame was also designed for aerodynamic efficiency. In the past, engineers tended to only consider how air passed over and under a performance car. The C7 literally breathes. Spaces under the car’s skin and in between the chassis structure were designed for the internal ducting for engine cooling, brakes, transmission, and differential cooling, and venting. Other spaces allowed for electrical and plumbing fixtures for coolant, fuel, and air conditioning ducting.

The C7 design team worked closely with the Corvette Racing Team on airflow management because even racecars are concerned about fuel consumption, as well as top speed dynamics and stability. Two of the most obvious ducting and venting features is the air extractor on the hood, and the NACA ducts on the top of the rear fenders.

Taking a lesson from the C6.R Corvette racecars, the C7’s radiator is tilted forward. One-third of the air that passes through the radiator is vented out of the hood. The hood louvers are angled so that the exiting air flows tightly over the car creating additional downforce to the nose of the car; thus eliminating the dreaded nose lift.

Heat exchangers (radiators) for the transmission were placed in the back, close to the transaxle with air ducted through the NACA duct feeding into the heat exchangers and then vented out through vents next to the taillights. This is just another example of how every element on the C7 has a defined purpose.

All of the foundational work that went into the C7’s chassis laid down a structure what was easily adaptable to the $2,780 Z51 suspension option that included; performance brakes with slotted rotors; dry-sump oil system; suspension upgrades; special wheels and tires; electronic limited-slip differential with a cooler, performance gearing, and an aero package. The Z51 was for drivers that wanted to use more of the C7 460-horsepower and explore the pleasures of the C7’s superior structure.

The 2015 Z06 with its supercharged 650-horsepower LT4 engine, wide-body, suspension, and tire enhancements work wonderfully with the C7’s basic structure. The same can be said for the 755-horsepower ZR1; the basic structure is up to the task. Arguably, the most interesting use of available C7 components is the Grand Sport. It has the aggressive-looking Z06 body and suspension parts that take using the base model’s 460-horsepower to a whole new level.

I will now go out on a limb. At the C7 ZR1 debut in 2018, Juechter said that his engineers had taken the C7 as far as they could with the ZR1. Are they working on a C9 Corvette to sell alongside the mid-engine C8? If so, will it be built on a carbon fiber chassis? When it comes to Corvettes, things always evolve upward. – Scott

Corvette Chassis History, Pt 1 – C1 Chassis – HERE

Corvette Chassis History, Pt 2 – C2/C3 Chassis – HERE

Corvette Chassis History, Pt 3 – C4 Chassis – HERE

Corvette Chassis History, Pt 4 – C5 Chassis – HERE

Corvette Chassis History, Pt 5 – C6 Chassis – HERE

Chassis History, Pt 5: Dave Hill Strikes Again! Delivers evolutionary, but superior C6

Published on January 17, 2020January 20, 2020 by Scott

Dave Hill’s 2006 Z06 stunned everyone with its stiffer than stock aluminum frame.

Dateline: 1.17.20 – Graphics by K. Scott Teeters, Images from GM archives: Corvette fans have been frustrated for years with Chevrolet’s evolutionary Corvettes. The “pie-in-the-sky” mid-engine Corvette has been around since the 1960s and anything less was evolutionary. The pending C8 aside, the C5 was the most revolutionary Corvette; because of the hydroformed steel perimeter frame, center backbone, all-aluminum LS1 fuel-injected engine, and transaxle. The C5 was the most solid Corvette ever offered and allowed engineers to vastly improve the basic suspension, the Z51, and the Z06. The racing C5-R won its class at Daytona in 2001 and 2003; won its class at Sebring in 2002, 2003, and 2004, and won its class at Le Mans in 2001, 2002, and 2004. This never would have happened without the superior basic C5 chassis. Dave Hill’s team got the C5’s chassis design so right that by 1999 they determined that a C6 needed to be started.

Whereas the C5 structure was revolutionary, the C6 was evolutionary. While the C6 chassis is different from the C5, it is essentially the same hydroformed steel perimeter frame with a center backbone, with the engine, torque tube, and transaxle all as stress members of the overall structure.

Let’s start with the basic C6 chassis. The chassis has a 1.2-inch longer wheelbase of 105.7-inches, but the overall length is 5.1-inches shorter than the C5 chassis. To achieve this, engineers shortened the frame rails 2.4-inches and changed the tube-formed front bumper beam to a unit made with two channels welded together to save 2/3s of an inch. The shorter frame with less overhang on the body achieved a total of 5.1-inches of length on the C6, over that of the C5. The shorter frame also increased the torsional stiffness. And to reduce squeaks, rattles, and vibrations, high-strength steel braces were added to the frame to improve structural rigidity.

Weight savings were picked up by using extruded aluminum beams in the interior instead of the cast aluminum beams from the C5. The instrument panel has additional brackets for the beam under the dashboard. Side-impact beams were made of aluminum and saved 4.5-pounds, plus the doors do not have traditional latch and lock mechanisms. Aluminum braces were used through the structure to improve crash performance. The front skid-bar in front of the radiator is also aluminum. An aluminum panel that saved 1-pound and increased stiffness replaced the steel driveline panel under the driveline torque tube. To increase upper rigidity, the windshield frame has extra gussets. And the trunk uses lightweight plastic braces. Corvette systems engineer Ed Moss said, “We are making it (the C6) smaller, lighter, but stiffer.”

The issue of stiffness in high-powered sports cars with wide tires cannot be under-estimated. Increased grip, torque, and horsepower will put tremendous added stress to a performance car’s structure. Imagine what would happen if a LT5 engine and big tires were applied to a stock C1 chassis. The C5 1999-2000 Corvette Hardtop, with its bolted and bonded hardtop increased the overall structural stiffness by 12-percent, enough to make it an excellent base to build the Z06 upon. The basic C6 platform offered a significant improvement in stiffness that made it an excellent platform to build the Grand Sport that used Z06 suspension parts and wide tires. Without any increase in power, the Grand Sport was a better Corvette. Stiffness matters.

While the C6’s suspension is similar to the C5’s, there are no carryover parts. The basic design of the short-long A-arms, transverse composite leaf springs independent suspension is the same. The control arms, springs, dampers, bushing, sway bars, and steering gear are all completely redesigned. New hub knuckles and dampers allow for greater suspension travel thanks to improved clearance. One issue with C5s was road noise and twitchiness on rough roads. To improve handling and ride, steering geometry and the progressive rates of the composite springs were improved.

Like the C5 the C6 offered customers three levels of suspension performance. Chevrolet calls the basic C6 suspension, “tuned for balance, ride comfort, and precise handling.” This is for the customer that wants a Corvette because they like “driving a Vette” with 400-horsepower on tap when they want a brief thrill, but aren’t interested in exploring the limits of tire grip.

The F55 Magnetic Selective Ride Control was a $1,695 option with some amazing technology. Magnetorheological dampers use metal-infused fluid that controls the viscosity of the fluid with a magnetic field created by an electromagnet. This semi-active suspension adjusts the fluid via a computed to adjust damping rates based on road surfaces down to the millisecond. The active handling and antilock systems were smarter and less intrusive.

And for the enthusiast that doesn’t want to go for the serious big gun Z06, but wants the most from their base model Corvette, there was the $1,495 Z51 Performance Package. The F51 option has been around since 1984 with a starting price of $600 with prices fluctuating through to 1990. Then from 1991 to 1995 Chevrolet offered the $2,045 Z07 Adjustable Suspension Package. The Z51 option was back in 1996 but consisted only of stiffer springs and stabilizer bars for $350 from 1996 to 2003, then $395 in 2003 and 2004.

The Z51 was part of the C6 lineup from 2005 to 2009 and was a whole different animal. Costing $1,495 in 2005, then $1,695 from 2006 to 2009, the Z51 package was the most comprehensive Z51 package ever offered, consisting of; higher rate springs and shocks; larger sway bars; larger cross-drilled rotors – 13.5-inch diameter on the front and larger 13-inch diameter on the rear; coolers for the engine oil, transmission, and power steering; higher-grip Goodyear EMT tires; revised gear ratios for the 6-speed cars.

An interregnal part of the overall objective of a smaller, lighter, and stiffer C6 was the body. For the body part of the C6, designers wanted to improve the fit of the body panels and reduce weight. For the broad flat parts, such as the hood, doors, trunk lid and tonneau cover on the convertible, SMC – Sheet Molded Compound was used. This is a fiberglass mixed with resin that is compressed into a mold, with a chemical reaction and the heat from the compression curing the part. For more complex shapes, such as the front grille and the rear fascia, PRIM – Polyurethane-Material Reinforced-Reaction Injection Molding was used. The removable roof panel was made from Polycarbonate, either transparent or painted.

But the major breakthrough for the C6 chassis was the all-aluminum chassis for the Z06 and the ZR1. The basic chassis design is the same except that the hydroformed side rails are made of 4-mm 5745 aluminum alloy. The standard C6 steel frame thickness was 3-mm and weighs 502-pounds while the aluminum Z06 frame weighs 392-pounds; that’s 110-pounds lighter, or 22.5-percent lighter. The Z06 frame is 50-percent stronger in torsional and bending stiffness. The Metalso Metal Fabricator, in Hopkinsville, Kentucky manufactured the aluminum frames and then shipped them to the Corvette Bowling Green assembly plant. The engine cradle and fixed-roof panel are magnesium, and the floorboards were carbon fiber.

Everything tends to move upward in the world of Corvettes. When the Z06 debuted in 2006, no one imagined that the C7 base Corvette would ride on a C6 Z06-like chassis.

Scott

Corvette Chassis History, Pt 1 – C1 Chassis – HERE

Corvette Chassis History, Pt 2 – C2/C3 Chassis – HERE

Corvette Chassis History, Pt 3 – C4 Chassis – HERE

Corvette Chassis History, Pt 4 – C5 Chassis – HERE

Corvette Chassis History, Pt 6 – C7 Chassis – HERE

Corvette Chassis History, Pt.4: The C5 Chassis That Dave Hill Built

Published on January 16, 2020December 10, 2024 by Scott

The C5 Corvette’s Momentum Chassis took the Corvette to a whole new level and paved the way for the C5-R Corvette

Dateline: 1-16-20 – Graphics by K. Scott Teeters, Images from GM archives: Structure is everything. Lessons learned from the C5, C6, and C7 Corvettes is that the stiffer the chassis, the better the suspension can be tuned for improved handling. The C1 to C4 chassis’ were fine for their day, but compared to the modern Corvettes, they leave a lot to be desired, especially if bigger tires and more horsepower is applied. The issue of structure is not new; look at what the Greenwood brothers were doing with the chassis of their widebody IMSA Corvettes in the 1970s. The NASCAR cars of the 1970s had fortress-like cages welded to their frames; but you can’t live with structures like that for streetcars. The arrival of the C5 was a quantum leap in terms of structure.

Image: GM Archives, 1997 Corvette Brochure

Joe Spielman ran GM’s Midsize Car Division in 1992 and was responsible for forty-percent of the engineering and manufacturing of GM’s auto production. It was a bad time for GM and despite the Corvette’s iconic status; its future was in jeopardy. Spielman created the “Decision Makers” that included himself, Carlisle Davis, John Cafaro, and Dave McLellan. Three possible formats for the C5 Corvette were created. The first format was the “Momentum Architecture” that featured a stiff backbone, front-engine, rear transmission, and an evolutionary body style. The second format was the “Mid-Engine”, favored by McLellan and GM President Jack Smith. The 1990 CERV III wasn’t just a dream car, it was built with manufacturing in mind, but was going to be complex and expensive. The third format was “Stiffer and Lighter”. This would be the least expensive and was a stiffer, lighter version of the C4. Fortunately, the team went with the “Momentum Architecture”.

The problem was money. When Dave Hill took over, as Corvette chief engineer in November 1992, his 1993 development budget was just $12 million. The estimated total cost to design and develop the C5 was originally $250 million and was cut back to $150 million; GM was in financial trouble and was cutting everything. But Chevrolet general manager Jim Perkins saved the Corvette by juggling an extra $1.2 million so that Hill could build a demonstration car. Another consideration Perkins wanted to see was a “Billy Bob” no-frills concept. Hill’s demonstration Corvette would become the CERV IV, with a manual transmission. Later Hill build an automatic version called the CERV IVb. The “Billy Bob” concept wasn’t developed until 1998 and became the 1999 Hardtop, that later became the now-legendary Z06.

The CERV IV was a true stealth development car. The chassis had the backbone structure of the proposed “Momentum Architecture” plan, but was clothed in a C4 body so that Hill and his team could drive the car on public roads, as well as the Proving Grounds in Michigan and Arizona. To the public it was just another C4 Corvette. Hill’s objectives for the CERV IV were to; prove to GM’s president Jack Smith that his team could reinvent the car, as well as the building process. When Hill took people for test-drives, they said, “This is like no Corvette we ever felt!” Hill’s plan worked, he got his C5 development budget up to $241 million, and set his team to work.

Hill wanted the C5 to be able to do everything as well as, or better than the C4. The C4 had a 350-mile range; Hill wanted 370 for the C5. The solution to the fuel range was a blessing because instead of one tank mounted on top of the rear of the frame, the C5 has two tank placed low on each side of the transaxle. This also helped lower the C5’s center of gravity. Hill wanted a coefficient of drag of .29, the lowest of any production car at that time, so he had to lean on designer John Carfaro.

But the piece de resistance of the C5’s new structure was its hydroformed frame. The first mass-produced automotive application of Hydroforming was for the instrument panel support beam in a 1990 Chrysler mini van. The 1997 C5 Corvette was the first mass-produced automobile to use this manufacturing technique on a major structural component. The frames of all pervious Corvettes were made from sheet steel, bent to form a box section. The box sections were then welded together to form the side rails and cross members. Hydroforming creates complex shapes that are stronger, lighter, and more rigid. After engineers designed the shape of the C5’s frame rails, sheet steel was rolled into a tube, laser-welded, and bent into the basic shape of the frame rail. The shaped tube was then placed inside a form and sealed. Water was then pumped into the tube at 7,000 psi that inflated the steel into the shape. The finished side rail was one, 13-foot long piece, instead of many boxed pieces all welded together. The crossmembers and attachment brackets, (36 pieces in total) were welded by robotic and human welders. Convertibles have 33 parts, one extra for the tonneau cover latch.

The second major structural component on the new C5 was the longitudinal center tunnel backbone. This kind of construction had then only been seen on exotic supercars and racecars. The center backbone creates the driveshaft tunnel and locks the front and rear of the frame together. The C4 designers had a long driveline support torque bar that bolted to the end of the transmission and the rear differential, whereas the designers of the C5 created an enclosed torque tube that bolted to the back of the bellhousing and the front of the transaxle, with a lightweight Metal Matrix Composite (MMC) driveshaft. The torque tube that connects the engine with the transaxle, was then bolted to the frame. Combined with the center backbone, the C5’s chassis structure is four times as stiff as the C4. This was an amazing accomplishment for a mass-produced sportscar.

With the strongest structure ever created for a Corvette, Hill’s suspension engineers were better able to design components to fine tune wheel control. Now the suspension didn’t have to compensate for a flexing structure. The selection of springs, dampers, anti-roll bars and bushings can be more accurate. The C4 suspension was very good and is today used often on street rods. The C5 went to the next level with double A-arms on all four corners of the independent suspension. The new aluminum suspension components are made using the then-new process of casting-and-forging to create lighter, stronger parts.

The C5 came with three levels of suspension. The standard FE1 was for basic driving and used specifically selected fiberglass composite leaf springs, shocks, sway bars, and bushings. The $350 optional Z51 suspension had stiffer springs, shocks, and larger-diameter sway bars. Active suspension options had been around since 1989; the new C5 offered the latest version of the F45 Selective Real Time Damping for $1,695. The C5’s basic dimensions tell us a lot. The C5 is 179.4-inches, 1.1-inches longer than the C4; 73.6-inches wide, 2.9-inches wider than the C4; 47.8-inches in height, 1.5-inches taller than the C4; 104.5-inch wheelbase, 8.3-inches longer than the C4; and 3,221-pounds, 77-pounds lighter than the C4. Wider, lighter, stiffer, with an all-aluminum engine, transaxle, and over 1,200 fewer parts, the C5 was the most revolutionary Corvette to date. – Scott

Corvette Chassis History, Pt 1 – C1 Chassis – HERE

Corvette Chassis History, Pt 2 – C2/C3 Chassis – HERE

Corvette Chassis History, Pt 3 – C4 Chassis – HERE

Corvette Chassis History, Pt 4 – C5 Chassis – HERE

Corvette Chassis History, Pt 5 – C6 Chassis – HERE

Corvette Chassis History, Pt 6 – C7 Chassis – HERE

Corvette Chassis History, Pt. 3: The C4 Chassis That McLellan Built

Published on August 9, 2019January 20, 2020 by Scott

After 20 years of use, the C2/C3 Corvette chassis was finally replaced with a strong, lightweight, vastly improved chassis and structure.

Dateline: 8.9.19 – Illustrations from GM Archives, Grahics by K. Scott Teeters – The C2/C3 chassis had an amazing 20-year production run. When Dave McLellan took over as Corvette’s chief engineer in 1975, the Corvette was overdue for a redesign. The only good thing about the 1970s was that Corvettes sold very well. On January 22, 1979 McLellan received approval to start designing the C4 Corvette.

One of the C3’s endearing features was the T-top roof. The design wasn’t just for aesthetics; the T-bar connected the A-pillar windshield frame to the B-pillar frame “roll bar” and provided significant structural stiffness. The initial design of the C4 had a T-bar connecting the A and B-pillars, but with a one-piece, roof panel. It wasn’t until the first prototype was built in 1981, when Chevrolet general manager Lloyd Reuss made the decision to eliminate the T-bar to open up the cockpit. This single decision impacted the C4 design such that the biggest complaint about C4s is the tall side frame sills that make ingress and egress challenging. To compensate for the lack of the important T-bar, the side frame sills had to be made extra tall. As the years rolled by, C4s, especially the convertibles, took heat for not being as stiff as their competitors. Those two elements, plus the fact that progressive Corvettes kept getting better and better, are part of the reason why C4s are today the least desirable of all Corvettes.

McLellan’s engineers had two overriding design elements; first, they wanted a lower overall height; and second; they wanted more ground clearance. McLellan’s team started placing the big pieces in a process they called, “stacking”. Starting at the ground level, the engine had to be lower to improve forward visibility. Previous Corvettes had been two-part cars; a body bolted on to a chassis. But the C4 was a three-piece car, which included, a chassis, a birdcage, and a body. This created a more integrated body and stronger configuration.

The C4’s parameter frame was built from 18 pieces of stamped and boxed high-strength steel that included the tall side sills, the front sides, the rear sides, four crossmembers and braces. All of the pieces were put together in a jig and welded together. The birdcage section included the forward door jams, the dash crossmember, the A-pillar, the rear section of the floor pan, and the B-pillar. The completed birdcage was then welded to the parameter frame. An aluminized steel engine and front suspension cradle positioned the engines and provided mounting points for the front suspension. The rear section of the frame was aluminum and provided mounting points for the rear suspension and rear bumper.

Unlike the previous chassis’ that had the engine, transmission, and suspension simply bolted to the frame, the C4 used a steel driveline support that was bolted to the rear of the transmission and connected to the rear differential that housed the driveshaft. By doing this, all of the components became stress members of the chassis structure.

Thanks to the C4 Corvette’s unique clamshell hood, Corvette owners got to see more of their front suspension than ever. Gone were the days of heavy stamped steel upper and lower A-arms. The C4’s front A-arms and spindles were slender, computer-designed forged aluminum. The C4 suspension used composite leaf springs on the front and rear suspension. Don’t let the term “leaf spring” throw you. These are computer-engineered, high-tech, lightweight suspension parts. A composite fiberglass monoleaf spring was first used in 1981.

To download a PDF version of the 1984 Corvette brochure, CLICK HERE.

C4’s multi-link rear suspension eliminated the C2/C3 rear end “squat” upon hard acceleration. This setup uses upper and lower control rods that connect the wheel bearing yolks to brackets mounted to the vertical section of the of the rear of the frame. Each bearing yolk has support rods that tie it to the rear differential. Today when we look at C4 Corvettes, especially tired old examples, the frame and suspension looks somewhat crude and outdated. However, C4 suspensions are regularly harvested from salvage yards, cleaned up, and refreshed for street rods.

From the perspective of the C4 Corvette’s November 30, December 1, 1982 press debut, the car was a total “WOW!” The cover story of the March 1983 issue of Road & Track was “Corvette Spectacular!” The debut wasn’t unlike the debut of the C6 and C7 Grand Sport Corvettes, in that with virtually the same horsepower, teamed with a much better suspension (the Z06 on the C6 and C7 GS), the car is vastly improved. Automotive journalists were blown away by how tight and solid the new C4 was. But it was the skidpad performance that astounded everyone. Z51 examples had no trouble hitting 0.95g on the pad, and one Z51 with slightly wider front tires scored a 1.01g! Ferrari’s $80,000 512 Boxer could only generate 0.86g, and Richard Petty’s Grand National Stock Car scored 1.04g. The March 1983 issue of Popular Mechanics proclaimed, “1983 Corvette: Best American Car Ever!”

Bowling Green started the 1984 season early and consequently racked up the second-best ever sales season with 51,547 Corvettes sold. Media hype totally stoked Corvette fans for the Z51, such that 50.4-percent of all 1984 Corvettes were ordered with the $600 Z51 option. Then reality set in. On real roads the ride was for many unbearable, in fact, many owners of regular 1984 Corvettes weren’t happy with the ride quality. Corvette engineers acknowledged that they had “over-done-it” on the suspension.

For 1985 engineers softened the front springs by 26-percent in the front and 25-percent in the rear. Z51 springs were softened 16-percent in the front and 25-percent in the rear with larger stabilizer bars. 1985 also saw the return of a full-fledged fuel-injection system with the introduction of the L98 that had a 25-horsepower bump that made the Corvette, according to Car and Driver, “The Fastest Car In America”. It was also the beginning of a three-year romp by Corvettes in the SCCA Showroom Stock Series. Corvettes so dominated the series they were kicked out in 1988 and Porsche bought a C4 Corvette to learn why the car was so fast.

But as power started to nudge up and tires got wider, the inherent design flaw with the C4’s lack of a T-bar was more obvious, especially on the convertibles; even with a bolt-on X-brace on the bottom of the chassis that raised the ride height 10mm. Since there are so many C4 Corvettes out there that few want, unless the car is a special edition or a pace car, you can do almost anything to a C4 and never get any heat. I learned from the C4 forums that many C4 owners that are hot rodding their cars use the factory X-brace and frame torsion rods to stiffen the structure of their car. Makes sense if you are adding a lot more power and bigger tires.

The C4 had a long run of 13-years. Towards the end of McLellan’s tenure as Chief Engineer in the early 1990s, he pushed for the C5, but GM was having money trouble and was in no mood for a new Corvette. In fact, they were considering eliminating the Corvette. By September 1992, McLellan retired and the following month, Dave Hill was the new Corvette Chief Engineer. The C5 Corvette would be Hill’s to design.– Scott

Corvette Chassis History, Pt 1 – C1 Chassis – HERE

Corvette Chassis History, Pt 2 – C2/C3 Chassis – HERE

Corvette Chassis History, Pt 3 – C4 Chassis – HERE

Corvette Chassis History, Pt 4 – C5 Chassis – HERE

Corvette Chassis History, Pt 5 – C6 Chassis – HERE

Corvette Chassis History, Pt 6 – C7 Chassis – HERE

Corvette Factory Show Cars 1961 Mako Shark-I, Part 2 – VIDEO

Published on August 7, 2019August 7, 2019 by Scott

Bill Mitchell’s First Shark Corvette, the 1961 Mako Shark-I

Dateline: 8.7.19 – Photos from GM Archives – Upon Harley Earl’s retirement in 1958, William L. “Bill” Mitchell took over the reins as V.P. of General Motors Design. Earl hired Mitchell in 1935 and Bill essentially learned his trade working under Earl’s guidance. Mitchell was a car guy, an illustrator/designer, and came from the world of advertising. Bill was so good, such a natural, that a year after Earl hired him; he was put in charge of the Cadillac design studio! Mitchell got along famously with Earl, which was not an easy thing to do, as the 6”-4” Harley Earl was known to be a tough and intimidating taskmaster! By 1953, Earl handpicked Mitchell to be his successor, but warned Bill that he’d have to prove himself and make his own mark. Earl’s designs were long, low, and rounded. Mitchell’s philosophy was that a car’s lines should be crisp and sharp, like a freshly pressed business suit.

A year before Mitchell was given the keys to Earl’s Design Kingdom; he was tasked with designing a body for the proposed 1960 Corvette that was to be part of Ed Cole’s line of transaxle-equipped “Q-Chevrolet” cars. One of the members of Mitchell’s advanced design team was Peter Brock, the youngest designer ever hired by GM. One of Brock’s sketches was the closest to what Mitchell had in mind, and became the body for what was later called, the “Q-Corvette”. Unfortunately, the Q-Corvette never made it past a full-size clay mockup, as the entire Q-Chevrolet concept collapsed due to the high cost of tooling for the transaxles. But Mitchell couldn’t let go of Brock’s brilliant design. Shortly after Bill’s big promotion, he indulged himself by deciding to “go racing” with the 1957 Corvette SS mule chassis, draped in a roadster version of the Q-Corvette body design. This became Mitchell’s 1959 Stingray Racer.

Bill’s privateer racing effort wasn’t just “an executive at play”; he was testing the public’s reaction to what he had in mind for the next Corvette – HIS Corvette! Mitchell raced the Stingray Racer for two seasons and it was no secret at the track that the car was his. Even though the body of the car looked nothing like the then current Corvette, and didn’t say “Corvette” anywhere, a Fuel Injected 283 “Corvette” engine powered the car, and it was the VP of GM Styling’s car, so the connection was obvious.

Part of Mitchell’s natural genius was an inner knowing of what the public would like. The public response to the Stingray Racer’s body shape confirmed what Bill knew; the next Corvette would look like his Stingray Racer. Mitchell also understood “show biz” from his time in advertising and through working with Earl on many Motorama events. So, to keep stoking the Corvette and Chevy fans, he created a functional street version of the Stingray Racer. What looked like a prototype Corvette was in actuality another in a long line of teaser show cars. After nine seasons, Corvette lovers were ready for a new machine. The XP-755, aka, the “Mako Shark,” was truly the shape of the future. What Corvette fans didn’t know was that while the Mako Shark was knocking their socks off, Chevrolet was hard at work sorting out the final design of the 1963 Corvette.

This was no small task, as everything except for the engine, transmission, and brakes were completely new. Except for details such as, vent placement, grille, bumper shapes, and the shape of the coupe’s famous, iconic roof section, the second-generation Corvette was nailed down. Bill’s Mako Shark (the XP-755) was an exaggerated version of the work-in-progress 1963 Sting Ray (XP-720). The Mako Shark was a show car to tease the public, as well as Mitchell’s occasional personal daily driver. Think of cars, circa 1961, when looking at the Mako Shark! There were still cars from the late 1920s and 1930s on the road in 1961!

Larry Shinoda was Mitchell’s preferred, go-to stylist guy and seemed to be the best at pulling Bill’s ideas into reality. According to Peter Brock (National Corvette Museum 2017 Hall of Fame inductee), Mitchell was just as tough as Earl, but more jovial and at times profane. Bill just wanted to be “one of the guys”, but he knew what he wanted. (Brock’s book, “Corvette Sting Ray: Genesis of an American Icon” is a MUST READ for all second generation Corvette fans.) Since Larry Shinoda worked out the translation of Brock’s Q-Corvette design into the Stingray Racer, Larry was tasked to do the XP-755, “Mako Shark”. Larry was also working on the XP-720, the 1963 Sting Ray, in its development phase.

Keep in mind that show cars are supposed to be “over the top”. (Remember the 2009 “Transformers” Corvette Concept car?) Since Larry knew every line on the work-in-progress for the 1963 Corvette, he exaggerated and used older elements from the 1958 XP-800. Starting with a stock 1961 Corvette, the Mako Shark-I’s nose and tail had more “point” than the production Sting Ray would have, and was in fact, the nose was 12-inches longer.

Shinoda knew that Mitchell loved “surface details”, so the Mako Shark-I had lots to gawk at, including; gills in front of the front fender opening, recessed areas on the hood, grille details on the hood, tube header side pipes/mufflers, an XP-800-like bubble top with a periscope rear-view mirror system and grille-vents in the back of the bubble, scoops on the rear fender humps, vents behind the rear wheel well openings, and two pairs of triple taillights. The engine was a 327 with a small, Roots-type supercharger and four side-draft carburetors. Outrageous four-pipe side-pipes exited from each front fender. Originally the Mako Shark had a stock 1961 Corvette interior, except for tight bucket seats and a Ferrari steering wheel that was gift from Enzo Ferrari! Chromed Dayton knock-off wire wheels gave the car that “European look”.

Mitchell’s fertile mind was always expanding upon existing show cars and he had no reservation about pulling a show car back into his design studio for a refresh. Years later, the interior was redesigned with flat panels and gauges that looked very Ferrari-like, a 427 engine with an automatic transmission was installed, and Shinoda-designed alloy lace wheels shod with wide tires were used. The bigger wheel/tire combo nicely filled the wheelwell openings.

Unlike many of Harley Earl’s Motorama cars that were basically static, full-size model cars, Mitchell felt that his show cars should be fully functional vehicles, capable of being driven and shown off in public. As much as the completed 1963 Sting Ray is an iconic classic, I believe that if the Mako Shark-I, minus some of the show car pizzazz, had gone into production as the “1963 Corvette Sting Ray” it still would have been a success. Imagine the Mako Shark-I with the Sting Ray roof – that would have been hot! – Scott

Tommy Storino’s 1986 “VADER VETTE”

Published on August 5, 2019August 5, 2019 by Scott

Tommy Storino Builds a Bas-Ass Street Machine 1986 C4 Corvette on a Budget

Dateline: 8.5.19 – Photos by Tommy Storino and Jim Broschinsky – When the C4 Corvette made its debut in the middle of 1983, the press was agog. Even though the new C4 only had 205-horsepower (five more than in 1982) and 290-lb/ft of torque (five more than in 1982), the all-new structure of the C4 used all the power the 5.7-liter Cross-Fire Injection Corvette engine so much better than the previous platform. The difference between the C3 and the C4 was as stark as that of the C1 to the C2.

Several of the 1984 Corvettes the press got to play with were equipped with the optional Z51 Performance Handling Package for an extra $600. The Z51 package included; heavy-duty front and rear springs, sway bars, shocks, bushings, quicker steering, an engine oil cooler, and an extra radiator (pusher) fan. Chevrolet offered the Z51 package on Corvettes up to 2001, except for the years 1991 to 1995. That’s an impressive shopping list of suspension parts and it all worked great on the smooth test track the press was allowed to drive on.

But when Z51-equipped 1984 Corvettes hit the roads, customers were in store for a harsh surprise. On anything less than a smooth road, the car’s ride was extremely harsh; so much so that in 1985 both the stock and Z51 suspensions were softened up considerable. So, Corvette engineers over-did-it a little and had to dial it back.

The thirteen-year C4 story was one of continuous refinement. In 1985 and 1986 the Corvette was “The Fastest Car In America” topping 150-mph. In 1985 the two-injector Crossfire Injection setup was replaced with L98 Bosch Tuned Port Injection electronic fuel-injection system that bumped power to 230-horsepower. In 1986 the L98 engine got aluminum heads half way through the production year and power was up slightly to 235-horsepower. Power kept increasing steadily until the arrival of the 300-horsepower LT1 in 1992 and finally the LT4 engine in 1996 with 330-horsepower. The LT4 was rumored to be under-rated, with a more accurate rating of around 360-horsepower.

This non-stop improvement created an unusual situation. As the new Corvettes kept getting better and better, the earlier C4 Corvettes became less and less desirable. The “to-die-for” Corvette from just a few years before was becoming two-day-old bread, or like out of favor 45-records being placed in the back of the rack. Adding insult to injury, it seems that because early C4 Corvettes are at the bottom of the pecking order, many get abused and or ignored, and become basket cases.

However, this situation does create an interesting condition for Corvette enthusiasts looking for a donor car. Early C4 Corvettes can be had for as little as little as $4,000. But for Tommy Storino of Chicago, Illinois, his 1986 Corvette deal was bitter sweet.

Tommy’s Uncle Pete was a Lincoln Towncar man because he was a very big man; 6’-4” and 350-pounds. So the family was surprised when he bought a 1986 Corvette, and wondered if he was playing a joke on them. No one knew why he would ever buy a Corvette. Two months later, he died suddenly.

After the funeral proceedings were completed, Tommy’s cousin invited him to stop by the house to look at the mystery Corvette. Tommy’s cousin is a Jeep guy and wanted to restore the Corvette, but he just didn’t have the time. The car pretty much needed everything, except for the interior, which was in very good condition. But everything else; paint, tires, engine, transmission, you name it, was shot. And the car was leaking fluids.

When Tommy’s cousin handed him the keys, he thought his cousin wanted help getting the car out of the garage. Actually he did. Then his cousin said, “Take it, it’s all yours!” The car was drivable, but obviously needed a lot. Now Tommy had the beginnings of a project car, and he didn’t have to spend $4,000 for a donor car.

Storino’s project started in June 2015. Tommy explained, “I always liked the early C4 Corvette before they went with the round taillights and the LT1 engine. I liked the clean look of the early C4s and the digital dash. When I got the car it had a set of mint condition 1987 wheels and the paint was in terrible condition. I wanted something sinister-looking with racecar looks.” Black-on-Black-on Black was to be the overall theme.

The L98 Tuned Port Injection engine was pulled and completely rebuilt; nothing radical, but reliable. The all-black theme was carried over into the engine compartment with the only splash of color being the intake runners and valve covers hydro-dipped carbon fiber, Corvette badges on the valve covers, red ignition wires, and polished Exotic Muscle Longtube Headers. All of the car’s basic systems were refreshed; cooling system, brakes, power steering, shocks, and the automatic transmission was rebuilt.The rear suspension received new universal joints, the differential was refreshed, and a new 3.75:1 gear set was installed.

To achieve the racer-look Tommy was going for, the suspension was lowered one-inch. The ’87 wheels were swapped out for a full set of 1990 ZR-1 saw-blade wheels that Tommy had power-coated black and shod with ZR-1-size tires; P275/40ZR-17 on the front and P315/35ZR-17 on the rear.

Corvette racecars have ground effects, right? Tommy’s Corvette has a rear wing that he’s not sure of who the manufacturer is, but he’s been told that they are no longer being made and are quite valuable. The adjustable front splitter and rear defuser are both hand-fabricated.

Storino lucked out on the car’s black paint. The original paint was stripped and the body was in surprisingly good condition, with no major problems and no Bondo. Tommy requested GM Black paint, but his painter always wanted to paint a car with very expensive House of Colors paint, so that’s what he used and didn’t charge Tommy any extra for the paint. The GM Black has a small amount of brown in to warm up the black a little. The House of Color black has blue in it, giving it a cold-black look.

The taillights are custom-made LED units with black-tinted clear lens and the side markers are also tinted black. And the glass is tinted black. Tommy also installed HID headlights and HID fog lights. The only color on the car’s exterior is black. It all makes for a stark contrast when the windows are down with the factory Bright Red interior.

Appearance aside, one of the most interesting mechanical details on Storino’s Corvette is its exhaust. The Exotic Muscle Longtube Headers connect to stainless steel 3-inch pipes with an x-pipes and MagnaFlow mufflers. Where the exhaust pips bend at the back to connect with the mufflers, Tommy had a solenoid-controlled cutout setup installed. “Cutouts” have been around for a very long time, but we typically see various kinds of Cat-Backs on Corvettes and not cutouts such as these. Tommy says, “Sometimes I just like to drive with open headers, just for fun!”

Between the Black-on-Black-on-Black with the Bright Red interior, the bodacious ground effects, bright LED lighting, and booming exhaust note, Tommy Storino’s 1986 former “basket case” Corvette is anything but subtle. After Tommy posted photos of his Corvette on social media, the car picked up the nickname, “Vader Vette”. We concur that the name totally fits. With the open headers you can almost hear Darth Vader saying, “Tommy… I’m… your Corvette!” – Scott

PS – You can keep up with Tommy Storino here… https://www.facebook.com/tommystorino