Duntov’s New 1963 Z06 Corvette Sting Ray Battles Shelby’s New 289 Cobra and WINS!
Dateline: 6-3-22 This story originally appeared in the February 2008 issue of Vette Magazine
Introduction: The C8 Z06 has just about taken all the air out of the room when it comes to talking about Corvettes. The April 28, 2022, Michelin Corvette Bash at the National Corvette Museum was astonishing. Engineers from Michelin and the Corvette team were on hand presenting seminars loaded with technical information about the new C8 Z06. A week or so later, Team Corvette teased fans with a 30-second teaser of the 2023 Hybrid All-Wheel-Drive Corvette that will supposedly be released in 2023. Continue reading “Z06 Corvette Review, Pt 2 – The ORIGINAL Z06 – the 1963 Z06 Corvette”→
DATELINE: 3-19-22, this story first appeared in the January 2017 issue of Vette Vues Magazine – The C8 mid-engine Corvette is arguably the biggest news in the world of Corvettes since the very beginning in 1953. Many of us thought Chevrolet would never offer such a Corvette, but here we are. And thanks to an established pattern of performance track-model Corvettes that started in 2001 when Chevrolet decided to brand the car, “Z06” after the one-year-only 1963 Corvette, subsequent new model Corvettes have offered a Z06 model. Within minutes after the C6, C7, and now C8 Corvettes were debuted, fans’ second question (after “how much is the new Vette?”) is, “Where’s the Z06?” Yes, we expect it and Chevrolet has not let us down since.
As of this writing, Chevrolet has their Traveling Road Show in full-swing at select Chevrolet dealers to show the loyal faithful exactly what the new C8 Z06 is all about. On March 25, 2022, Stingray Chevrolet, in Plant City, Florida will be hosting their C8 Z06 presentation. No doubt, owner Steve Hurley will put on a fantastic presentation.
So, with that in mind, the next dozen or so posts here on Corvette Report will present stories I have written for Vette Vues Magazine over the last ten years about the Z06. The C8 Z06 did not arrive from nowhere, there’s been a progression of Z06 Corvettes that go back nearly 70 years to 1963 when “RPO-Z06” was an obscure, one-year-only “racer kit” option that Zora Arkus-Duntov seeded into the 1963 Corvette option list that was essentially a “suspension and brakes” option on top of the L84 Fuelie. There were no external badges or special body enhancement and the car looked like any other Fuelie Corvette. And truthfully, unless a customer wanted to go road racing with their new Corvette, the Z06’s performance suspension and brakes were of little value on the street. There was no fanfare and after 1963, no one but Zora and his hardcore racer friends missed the Z06, so the Z06 faded into Corvette history; that it until the release of the 2001 model year. Ever since then, the Z06 was THE track weapon for Corvette racers.
So, let’s have a look at how we got to where we are with the C8 Z06. It is arguably the most exciting story in Corvette history. – Scott
When I was a wee lad and would see the term, “For Off-Road Use Only” I used to think, “Well who drives these cars in the dirt and grass?” What I didn’t understand was that the term is code for “RACING”! Beginning in 1957, Chevrolet’s new general manager, Ed Cole, made the command decision that he would let “customers” carry the Corvette racing mantle by offering Chevrolet-engineered parts, specifically designed for racing, available through the Chevrolet Parts Department. Continue reading “Z06 Corvette Review, Pt 1 – The 1963 Z06 Racer Kit”→
A loving tribute to a brother, a husband, a father, a hero, and the very first production Z06 Corvette Sting Ray racecar
We all have “defining moments” in our life. You know, those rare moments that can happen in an otherwise ordinary day that changes the course and direction of your life. It could be the day the prettiest girl in class “smiles that smile” that makes you forever a softie for blonds. Or, like for me, the day I saw a 1965 Corvette Sting Ray Coupe at a Chevrolet dealership and a salesman gave me a brochure with technical line art that helped set me on my life course.
In late September 1962, 16-year-old Doug MacDonald had such a defining moment. Doug’s big brother was road racing legend and 2014 National Corvette Museum Hall of Fame Inductee, Dave MacDonald. When your brother is eleven years older than you, while you are growing up, your perception is that your sibling is “one of the adults.” In 1960, Dave MacDonald started racing a 1957 Corvette when he was 23 years old and Doug was only 13, so the best Doug could do was hang around on the sidelines, take in as much as he could understand, and do his best to stay out of the way!
Dave MacDonald was one of a group of Southern California guys that were Zora Arkus-Duntov’s favorite people – young men that raced their Corvettes. These were the burgeoning years of the California car culture. What’a time to be a young man with a driver’s license and a knack for mechanics! Dave had a job at Don Steves Chevrolet and formed a friendship with salesman Jim Simpson. Together the young fellows bought a beat-up 1957 Corvette and built a racecar. Simpson helped get a small sponsorship from their employer and the two lads were off to the races.
The Dave MacDonald story is now legendary and I have covered Dave MacDonald’s amazing but short career in the October 2012 issue of Vette Vues. Dave was a natural and taught himself to drive racecars via the school of trial and error. It didn’t take too long before crowds started to notice MacDonald’s “tail out” driving style and quickly nick-named the young man, “The Master of Oversteer.” (Dave would have LOVED modern “Drifting” racing!)
What most of the young fellows that were honing their skills on the SoCal racetracks didn’t know was that important and powerful men in the racing and manufacturing were closely watching the amateur-racing scene, looking for talent. As MacDonald kept racking up an impressive string of wins, two of the most powerful men in manufacturing and racing were following Dave very closely – Zora Arkus-Duntov and Carroll Shelby.
MacDonald’s rookie year was 1960 when he took five 1st place wins out of 18 races – a 27% victory rate! The following year in 1961, Dave drove the Don Steves Corvette to 15, 1st place wins out of 25 races – a 60% victory rate. From January to April 1961 Dave and Jim won the first nine races. For the season, the guys only had three 2nd place finishes and five “DNF” (Did Not Finish), and one “DNS” (Did Not Start) race. One DNF race was with their all-new, Max & Ina Balchowsky purpose-built 1961 Corvette.
The purpose-built Balchowsky Corvette happened because one day at the track, Carroll Shelby told Dave and Jim that to take their racing to the next level, they should get a Balchowsky purpose-built car. “Purpose-built” racecars were hand fabricated, tube chassis cars with hand-made, lightweight fiberglass silhouette replica bodies. Think prehistoric tube frame Trans-Am cars. Balchowsky’s 1959 “Old Yeller II” was already a legend, so Max and his wife Ina were the “go-to” couple for competitive hand-made racecars.
When word got out that MacDonald and Simpson were building a tube frame Corvette, it got the attention of Mr. Duntov because he too was thinking about building a tube frame Corvette, but with the body of the upcoming new 1963 Sting Ray. Yes, we’re talking about the Grand Sport Corvette during its larva stage. One day, when Duntov was in the Los Angeles area, he stopped by MacDonald’s house for a visit and to check out what Dave and Jim were up to!
Doug MacDonald was just 14 years old then and recalled, “Mr. Duntov’s accent was so thick, I couldn’t understand much of what he said. Somehow, Zora and Dave understood each other enough, but I was completely lost.” A bond of racer’s respect was forged and Duntov would later put Dave to work for some interesting “field testing” opportunities. The 1,750-pound purpose-built car, now called the, “1961 Corvette Special”, was powered by a mildly modified 327 Fuelie, and had tremendous potential. Dave and Jim now had two cars they were campaigning on a small budget, despite the Don Steves Chevrolet sponsorship.
From October 1961 to May 1961 Dave and Jim raced the 1961 Corvette Special in eight races, taking four 1st place wins! But a close examination of the points standings showed that Dave and Jim had a better chance of a championship racing with their stock-based Corvette racer. So, the 1961 Corvette Special was sidelined. Both young men were gunning for a championship!
But Duntov’s meeting with MacDonald made a powerful impression on the Corvette chief engineer. By the summer of 1962 when preproduction Corvettes were ready for some promotional track testing, MacDonald and Dr. Dick Thompson were invited to a sampling. From June 29 to July 2, 1962, Chevrolet produced a promotional film with MacDonald and Thomson driving a ‘63 Coupe and Roadster at the GM test track. After a few laps, Mr. Duntov interviewed the drivers. The promotional film is titled, “Biography of a Sports Car” and fortunately is on YouTube. The television commercial for the then-new 1963 Corvette Sting Ray has footage of Dick Thompson and Dave MacDonald driving a coupe and convertible at the test track. This too is on YouTube.com.
A few weeks later, Duntov flew Dave and Sherry, Jerry Grant, and Bob Bondurant out to St. Louis to pick up three of Duntov’s latest “racer kit” Z06 Corvettes. Chevrolet brass decided to give Dave Z06 #1! That’s right, the Don Steves Chevrolet Z06 Corvette racecar is the first “official” Z06 to roll off the assembly line! Jerry Grant drove his Sting Ray out to Washington state, while Dave and Bob drove their cars to California.
Dave and Sherry loaded their suitcases in the back of the Sting Ray and headed west. Dave actually liked his lady driving a hot car. Sherry recounts, “A lot of times if I was driving one of our Corvettes, Dave was always telling me, “Drive faster, drive faster!” Do you think the MacDonalds opened up the Z06 on the way home from St. Louis? Sherry remembers seeing the speedometer pegged at over 140-mph! But the Z06 wasn’t their personal car; it was scheduled to become a racecar. The MacDonald’s would soon purchase a new Sting Ray as their personal car; a Riverside Red 1963 Fuel Injected Sting Ray Coupe with 4.11:1 gears, 4-speed, and power windows. Yes, it was very quick.
Meanwhile, back at home; Doug MacDonald could not have been more stoked! His big brother/hero was being flown around the country with all expenses paid by Duntov and Chevrolet. Dave was track testing preproduction Corvettes for Zora and now was one of four select racers (Dave, Jerry Grant, Bob Bondurant, and Mickey Thompson), personally invited by Duntov himself, to take delivery of what was supposed to be Zora’s secret weapon for his Corvette racer customers, RPO Z06. The all-new Sting Ray with its much-improved frame, structure, chassis, and Fuel Injected 327 was now available with a special suspension and brakes package that was designed for victory.
The long trip home was designed to break in the Z06 so that by the time the cars arrived in California, they could be prepped for the L.A. Times 5th Annual Grand Prix Race at Riverside 3-Hour Enduro in October. Doug’s big brother Dave and sister-in-law Sherry were driving the new Z06 home from St. Louis where the car had just rolled off the assembly line. This was VERY heady stuff for a 15-year-old kid!
Phone calls along the way kept the MacDonald family apprised of the trip home. When Dave and Sherry got off the freeway and called home, what they didn’t know was that they had company. “New Cars” were hyped back then, but not like they are today. Think for a moment what cars looked like in 1962, and then hold in mind the images of a 1963 Corvette Sting Ray Split-Window Coupe. There was NOTHING like it. The new Sting Ray looked like “the automobile from another planet!” Buck Rogers and George Jetson didn’t even have rides this cool!
Doug was waiting outside of his parent’s home when Dave and Sherry turned the corner of their street. Doug recalls, “I could not believe what I saw. The bright white Sting Ray was the most beautiful thing I had ever seen in my life! But as the car turned the corner of our street, a dozen or more other cars were following Dave and Sherry – and we didn’t live on a busy street. These people followed Dave and Sherry off the freeway and to our house because they wanted to see this stunning new Corvette! I’ll never forget it. We were all stunned!” The scene was forever burned into Doug’s memory and 54-plus years later, Doug MacDonald would be driving his own white Corvette Stingray, with a special purpose in mind.
With less than three weeks before the L.A. Times 5th Annual Grand Prix 3-Hour Enduro race, Dave and Bill Thomas (Mr. Cheetah) got as much done to prep the car as they could. Modifications were limited to rebuilding the engine, installing side exhaust, adding a roll bar, and removal of the bumpers. The Sting Ray’s fender humps and hood bulge were painted blue with red pin striping and “Don Steves Chevrolet” and MacDonald’s “00” lettering was added.
Anything can go wrong in an endurance race, even the simplest things. The biggest challenge to the new Corvettes was Shelby’s new Cobra that weighed 1,100-pounds less than the 3,100-pound Corvettes. In the first hour of the race, hard-charging MacDonald fought Billy Krause, driving the Cobra. Just before the end of the first hour, within minutes of one another, the driver’s side rear wheel of MacDonald’s Z06 came off (likely due to one or more loose lug nuts), then Krauss’ Cobra broke a rear axle. Later in the second hour, the engines in the Bondurant and Grant cars let go, leaving Doug Hooper, driving the Thompson Z06 to win the race.
Thompson, ever the showman, proclaimed, “I don’t think its ever been done before! A new production car winning the first time out.” While a “win is a win,” it was a default win because Corvettes would be chasing after Cobras until Duntov’s L88 arrived in 1967. Ironically this was the last time MacDonald ever professionally raced a Corvette. By the end of 1962, Carroll Shelby offered Dave a golden opportunity as a full-time driver. The Don Steves Corvette was raced a little, but nothing serious. The car has since been beautifully restored and is currently owned by Jim and Nancy Jaeger.
Life often offers up pivotal moments where a single decision can make profound changes. Dave MacDonald’s decision to take Shelby’s offer to professionally drive Cobras took Dave away from the world of Corvettes and into Shelby’s world of beasty Cobras – which Dave loved driving. Not only was MacDonald driving Cobras, he was helping to develop the cars. Dave was also deeply involved in the development of the fastback Cobra Daytona. He was also given the opportunity to race NASCAR stock cars. But back then, just as it is today, the big prize in American racing it to drive and win the Indy 500.
Mickey Thompson was called, “The King of Speed” because he was into anything fast on four wheels and “Sir Mick” wanted an Indy 500 win for his record. Thompson developed a radical, mid-engine Indy racer that was extra low to the ground thanks to its tiny 12-inch tires. The car debuted at the 1963 Indy 500 with mixed results, but after the race, Thompson hired MacDonald to drive for him the following year. But a month later, USAC officials mandated all cars run on 15-inch wheels for future 500s. This was devastating news to Thompson, as the change raised the car’s center of gravity, negated the unique design advantage, and caused the car to lift at speed.
Many of the top drivers of the day track-tested Thompson’s car but passed on driving for Thompson in the 1964 Indy race. However, MacDonald would stay loyal to his friend and not abandon him. Dave also viewed the Indy 500 as a big opportunity and that if he backed out, he’d never be invited back. (probably not so, but it looked that way to Dave) Many drivers questioned his decision. Racing legend Jimmy Clark was track practicing and following MacDonald on Carb Day when Clark pulled off the track after Dave and told him, “Get out of that carmate! Just walk away!” Later, Dave reiterated to Sherry that if he walked away, he’d be branded a “candy-ass”. Even Carroll Shelby tried to get MacDonald to change his mind with the promise of a ride in a really good car for 1965. But Dave’s “word” was his word”.
When the race started, MacDonald, ever the hard-charger, did what he’d always done on a racetrack – charged hard, passing everywhere he could. Racer Johnny Rutherford later reported that MacDonald’s car seemed to be handling badly and he thought, “He’s either gonna win this thing or crash!” At the beginning of the second lap, the Sears-Allstate Special went out of control and crashed, taking the lives of Dave MacDonald and Eddie Sachs.
Life for the MacDonald family would never be the same. Doug MacDonald was so overcome with grief and anger that he burned all of the memorabilia he’d collected about his brother’s racing career and he didn’t drive a car for several years. Sherry MacDonald raised their children; Rich and Vicki. After a long investigation, the Indy officials concluded that the crash was caused by the car’s design and there was, “No driver error!” In retrospect, one has to wonder why the car was approved to race in the first place.
But time heals most wounds – sort of.
Doug MacDonald eventually did some racing on his own and for a few years was a driving instructor at the Bob Bondurant Racing School. Over the years, Doug had a few stout Camaros and Corvettes. But for Doug, two things never changed; his passion for Corvettes and the memory of Dave and Sherry driving down his street in that brand new, white 1963 Z06 Corvette Sting Ray. Then in 2009, Doug made the leap into what was then, Chevy’s closest thing to an all-out racing Corvette, the C6 Z06. Doug’s Z06 was Atomic Orange and he added the rear spoiler and aftermarket hood.
In 2012 Doug had the opportunity to get a previously owned D&D Grand Sport replica. The car was a blast to drive but has its own unique ownership challenges. Grand Sport and Cobra replica cars show us just how rough and brutish the originals truly were. These are not cars that owners tend to drive a lot. They are loud, harsh, and garish. No one takes long trips in them, as they’re not especially comfortable. You can’t go to the store in one because; A. There’s no storage space, and B. You wouldn’t want to leave the car parked without an armed Blackwater Security guard or a big nasty dog! And C. they are cop-bait! Drivers often get pulled over so that law officers can get a good “look-see”. The limitations and routine can get old after a while.
In 2016 when Chevrolet debuted the C7 Grand Sport, Doug saw the possibility of fulfilling a dream of building a modern tribute to the Corvette he still couldn’t stop thinking about, the Don Steves “00” 1963 Z06 Corvette Sting Ray Split-Window Coupe. When Dave and Bill Thomas prepared the 1963 Z06 for the L.A. Times 5th Annual Grand Prix Race at Riverside, they didn’t have a lot of time or much budget, so the prepped racecar had stock black steel wheels. When Doug MacDonald saw that he could get a white Grand Sport with black wheels with blue center stripes, his tribute Corvette plan clicked into place. Combining his two passions into one, Doug sold his 1963 Grand Sport replica, and his C6 Z06, and bought his 2017 Grand Sport Corvette from Nate Chandler of Van Bortel Chevrolet in Macedon, New York because they advertised, “We can beat any deal!”
Doug ordered his Grand Sport with the following options; 3LT Adrenaline Red interior (top of the line), Competition seats, black wheels (just like Dave’s 1963 Corvette) with red calipers, blue center stripes, Heritage Package with red fender hash marks, the Phase II rear spoiler, and the Corvette Museum Delivery. The optional interior plaque reads, “In Memory of Dave MacDonald”. Doug later added the front aero winglettes and rear spoiler wickerbill. He also changed the car’s red taillight to clear taillights.
Doug’s Museum Delivery was also special. Doug and his lady, Sherry Sablan, dealership salesman Nate Chandler and his wife, all attended the Museum Delivery. All of the proper photos and certifications were fulfilled, the event was documented and posted on Facebook and lastly, Doug and Sherry drove the car home to California, just like Dave and Sherry MacDonald had done in September 1962!
It took Doug months of living with the car and looking at it to come up with a plan to complete his tribute. Doug wanted to replicate the 1963 racecar’s “white with blue stripes and trim” look on a very different body shape. Doug started with the basic Grand Sport center stripe and had the stripe extended forward, past the hood air extractor, and onto the front bumper cover to better match the look on the 1963 car. Doug’s fender stripes hit the mark perfectly by starting at the inside line of the headlights and flowing back, intersecting perfectly with the red fender hash marks, then flowing and thinning back towards the A-pillar. The rear fender strips just kiss the tops of the rear fender creases, splitting the space between the edge of the fender crease and the rear fender scoops, and flowing back. And at the back edge of the rear glass in white lettering, it says, “IN LOVING MEMORY OF 2014 CORVETTE HALL OF FAME LEGEND DAVE MACDONALD WWW.DAVEMACDONALD.NET”.
Doug MacDonald is absolutely delighted with his C7 Grand Sport Corvette tribute car. “I love everything about the car! The car’s looks, stance, the interior is gorgeous, the Competition Seats are excellent and I even like the automatic transmission, it shifts hard and quick. I’m sure Dave would love this car!”
I’m sure that Doug isn’t completely done with his tribute car. There’s a possibility he might have “stick on/peal off” vinyl “DON STEVES CHEVROLET” AND “00” in a round blue meatball made for the doors and hood, for when he displays the car at shows. But mostly, Doug and Sherry’s plans are to get into their 2017 Grand Sport and drive, drive, drive, and enjoy, enjoy, enjoy – just the way Dr. Duntov wanted all of his Corvette customers to do. – Scott
Dateline: 7.31.19 – As seen in the January 2019 issue of Vette magazine, Illustrations by K. Scott Teeters – When the 1963 Sting Ray made its public debut in September 1962, it was a total, “WOW!” And it wasn’t just the Corvette’s stunning new looks; it was the all-new chassis and suspension. By late 1959 Zora Arkus-Duntov was in charge of Corvette engineering. When Bill Mitchell’s design team started work on project XP-720 (the all-new Sting Ray), Duntov was called in to set the parameters for an all-new chassis. The completed Sting Ray looked like the sportscar from another planet and the chassis had everything except four-wheel disc brakes. Today the running chassis looks like a buggy compared to the stout aluminum, steel, and magnesium chassis’ of the C5, C6, and C7 Corvettes. But in 1963 the top-performing L84 Fuelie engine only had 360 “gross” horsepower and 352-LB/FT of torque putting power-to-the-ground with 6.70×15 bias-ply tires. That’s not much twisting on the chassis, so the chassis was more than adequate.
Even when the high-torque big-blocks arrived in 1965, for street use, the Duntov chassis could handle the job. The design didn’t start to show its limitations until the 1968 L88 racing Corvettes with wide tires started competing in long endurance races. Tony DeLorenzo once commented that after long 12 or 24-hour races, their Corvettes needed new frames. Their solution to this problem was a Logghe Brothers full welded-in roll cage. Greenwood’s wide-body Corvettes were so reinforced many asked, “Is there still a Corvette in there?” But for street use and spirited driving, the Duntov chassis served the Corvette well until 1982. Lets look at the chassis’ basics to see why it lasted so long
The genius of Duntov’s chassis was how much lower the center of gravity was. Chevrolet engineer Maurice Olley was a production car chassis and suspension expert when he designed the C1 chassis. As a racing expert, Duntov knew he had to get the center of gravity much lower. The C1’s chassis had a parameter frame with x-bracing in the center for rigidity. The car’s occupants sat on top of the frame. Everything measured from there; the cowl height, engine height, and everything else.
Duntov’s design eliminated the x-brace so that the occupants could be placed down inside the frame, dramatically lowering every data point from there. For rigidity the new frame had five crossmembers. Duntov then mounted the engine and transmission as low and as far back as possible and routed the exhaust pipes through holes in the second frame crossmember. The passenger compartment was pushed back as far as possible and the spare tire was mounted below the back of the frame and under the fuel tank.
The lowering of the engine/transmission and passenger compartment lowered the center-of-gravity from 19.8-inches to 16.5-inches. Moving major components as far back as possible in the shorter 98-inch wheelbase created a front/rear weight distribution of 47/53-percent. The engine centerline was offset 1-inch towards the passenger side because passenger footwell requirements were less than the driver’s. The extra offset reduced the transmission tunnel width and allowed the crankshaft and rear axle pinion to be on the same centerline. Ground clearance was just five-inches.
The build of the frame used boxed longitudinal sides with five crossmembers that were designed to suit the needs of styling. The new frame actually received computer analysis to determine the thickness needed for the parameters of the overall car. The front crossmember was welded to the sides and not bolted-on like the C1 chassis. The new frame with mounting brackets weighed 260-pounds, the same as the C1’s frame, but torsion rigidity increased from 1,587 lb/ft to 2,374 lb/ft per degree.
The C2/C3 suspension was a parts-bin marvel, although it didn’t seem that way. Duntov wanted an independent rear suspension and was immediately told, “No! It’s too expensive.” To get around this, Duntov used almost 60 full-size passenger car front suspension parts, including pressed-steel wishbones and ball-jointed spindles, and just rearranged them. The parts had already been engineered and proven, thus saving production cost. With a 9-degree slope, the wishbones gave an anti-dive reaction upon heavy braking. Then the inner pivot points were lowered to raise the roll-center to 3.25-inches above the ground. A recirculating-ball steering unit was placed behind the suspension and used a hydraulic damper to reduce kickback. All of these changes were very apparent when combined with the right shocks and anti-roll bars when the cars were first driven and tested. The money saved was more than what went into the rear suspension.
The independent rear suspension started with the differential pumpkin bolted to the 4th crossmember with the driveshaft as a device to control forward thrust from the wheels. Axle half-shafts with universal joints are on each side of the differential. Steel box-section control-arms carry the outer half-shafts and attach to the rear frame kickup assembly. Shims at the forward pivot-points are used to adjust toe-in alignment. Strut rods attach to the strut-rod bracket bolted below the differential and connect to the rear spindle support on the control-arms. The nine-leaf transverse spring with polyethylene liners between each leaf to reduce noise, mounts under the differential and is sprung against the rear portion of the control arm with long bolts. Duntov’s proposal to use a transverse leaf spring was not well received by Chevrolet chief engineer, Harry Barr, but no one could come up with a better plan.
For its time, Duntov’s chassis worked very well, but I’m sure that no one imagined it would be used for 20 years. The design proved to be easy to update. Disc brakes were in development when the Sting Ray came out and arrived on the 1965 model. When the new Mark IV became available in 1965 the suspension got stiffer front springs and larger diameter front and rear stabilizer bars. The new chassis was totally adaptable and could be made near-battle-ready with suspension component changes. During the 20-years of Duntov’s chassis, Racer Kits included; the 1963 Z06, 1967-1969 L88, 1970-1972 LT-1 small-block ZR1, and the 1971 big-block ZR-2. And from 1974-1982 there was the FE7 Gymkhana Suspension for spirited street driving. On the street, Duntov’s chassis could easily handle the 327 Fuelie to the LS6 454.
In the ‘70s chassis changes were made to conform to tightening regulations. Starting in 1973 the chassis had to handle the new 5-mph crash bumpers and steel side-door guard beams. In 1975 catalytic converters helped reduce emissions, but cloaked engines. A steel underbelly had to added to the chassis as a heat shield against the very hot converters. 1980 saw a big weight reduction from 3,503-pounds to 3,336-pounds thanks to an aluminum differential, lighter roof panels, thinner material on the hood and doors, and the use of the aluminum L84 intake manifold on the standard engine. The following year, a fiberglass-composite rear leaf spring helped shed 29-pounds. Early ‘80s Corvettes don’t get much respect because their restricted engines, but their drivetrain and suspension was as good as ever. An early ‘80s Corvette with a classic SBC crate engine would make for a stout performer.
Yes, Duntov’s chassis looks crude by today’s standards. But Corvette development is always empirical. If it weren’t for the C2/C3 chassis, there never would have been a C4 chassis, and so it goes. – Scott
Zora Arkus-Duntov: The Performance Godfather of all Corvettes
Dateline: 10.23.18 – One of the definitions of the word, “godfather” is; “one that founds, supports, or inspires”. Of all of the Corvette’s “Founding Fathers” none are more deserving of the term than Zora Arkus-Duntov. It is not an exaggeration to say that were it not for Duntov, the Corvette never would have made it past 1970!
Although the Corvette fit the definition of a “sports car”, when Chevrolet released the car in 1953, they said that the car was, “not a sports car”. But when Zora saw the Corvette at the 1953 GM Motorama in New York City, he said that it was the most beautiful car he had ever seen, and knew instantly that he wanted to be a part of the new Corvette team.
Zora was born on December 25, 1909 and his birth name was “Zachary Arkus”. Both of his parents were Russian Jews living in Belgium. His mother was a medical student and his father was a mining engineer. After the Russian Revolution the family moved back to Leningrad, Russia, but his parents divorced. His mother’s new partner was Josef Duntov. Years later, Zora and his brother, Yura added the surname, “Duntov” to theirs.
Josef Duntov was an engineer for the Soviet government and was transferred to Berlin, Germany. Zora loved Berlin. When he wasn’t attending classes at the Charlottenburg Technological University, he was drawing cars, writing papers, riding motorcycles, roaring around in his Type 30 Bugatti, and chasing girls. When Zora met Elfi Wolff, a beautiful German dancer with the Folies Bergere, it was love at first sight, and the couple married in France in 1939. When WW-II broke out in 1939, Zora and Yura wanted nothing to do with fascism, and joined the French Air Force. But when France surrendered, the entire Duntov family made plans to get out of France and immigrate to America.
All Zora ever wanted to do was build and race cars. After the family settled down in New York, Zora and Yura started the Ardun Mechanical Corporation, a machining company. Quickly, the company became a success, receiving an “A” classification with the Army Air Force Quality Control. Government work for the war effort made Zora and Elfi wealthy. After the war Zora and Yura made their contribution to the burgeoning hot rod industry that set the stage for Duntov’s part of the Corvette story.
Image: http://www.ardun.com/
Ford brought the V8 to the masses and it wasn’t long before guys started hot rodding the Flat-head V8 Ford. The design was cheap and simple, but didn’t breathe very well. Zora designed an aluminum, overhead valve hemi-head bold-on kit for the popular Ford flathead engine. The Ardun OHV Hemi heads took output from 100-hp to 160-hp; a 62-percent increase! They offered a conversion kit, a complete engine, and an all-out, 200-hp racing engine. While terrific as a concept, Zora wasn’t a “development engineer” and didn’t have the patience to sort out details. Through a series of business mistakes, the company eventually folded. Also, in 1946 and 1947 Zora had two failed qualifying attempts at Indy.
Photo: K. Scott Teeters – Duntov wanted to take a team of Corvette SS race cars to the 1957 24 Hours of Le Mans race, but the AMA Racing Ban stopped Zora’s Le Mans assault.
By 1948 Zora was looking for a racecar company to work for and took a job working for Allard England. Without a company to run, Duntov was able to stay focused on engineering and development work for Sydney Allard’s sports racing cars. In 1949 Zora raced an Ardun-powered Allard J2 at Watkins Glen, but had braking problems. Then in 1952 Zora drive a new Allard J2X at Le Mans, but broke an axle at the 14-hour mark.
Working for Allard was fun, but Zora knew there was no future there. In 1952 he came back to New York and started looking for employment with an American car company. Duntov applied with Chrysler, Ford, Lincoln-Mercury, Ford, and General Motors. Chrysler suggested that his racing engineering skills would be more suited to much smaller companies. He even tried Jaguar, but was rejected. A letter to GM’s Chief Engineer, Ed Cole in October was responded with an invitation to, “…stop by if you’re ever in Detroit.” But Cole passed Duntov’s letter to his head suspension/chassis engineer, Maurice Olley, who responded to Zora on January 5, 1953 with an invitation for an interview.
Around this time Duntov had his “Oh, WOW!” moment upon seeing the Corvette at the 1953 Motorama. After a long series of letters and interviews, on May 1, 1953, Zora Arkus-Duntov was hired by GM to work in the Chevrolet Engineering Department under Maurice Olley, with a starting salary of $14,000.
Zora and Elfie Duntov didn’t fit into the GM corporate culture, and Olley and Duntov did not get along at all. Zora solved engineering problems with an intuitive sense of mechanics – Olley wanted to see calculations. GM executives socialized at country clubs and played golf – Zora went to races and played around with boats on his weekends. Elfie passed on invitations to social lunches, preferring to spend time with her entertainer friends. Yes, the Duntov’s were misfits in GM’s stuffy gray suit world.
Three weeks into his employment Zora was almost fired by Olley because he announced that he was taking off to drive for Porsche at Le Mans in June. Although Duntov worked for Olley, he reported to Ed Cole, who begrudgingly let him go racing, but without pay.
Fortunately for all of us, Duntov got beyond his issues with Olley and was transferred to the GM Proving Ground. The work was beneath him, but he needed a job and soldered on. It was a speech he gave at a Lancing SAE meeting about how high-performance programs can enhance efficiency and reliability of passenger cars, and that the Corvette would be the perfect platform for such R&D work. While other engineers were more thorough in their development work, Zora had the deep understanding of racing, and the enthusiasm that could make Chevrolet an authority on performance cars.
By the time Duntov got to work on the Corvette, his initial conclusion was, “… the car really stunk.” Zora was coming from a racing perspective and the Corvette was never intended to be a racer. He said, “Since we can not prevent people from racing Corvettes, maybe it is better to help them to do a good job at it.” Thus began the evolutionary transition of a car that was never designed to be a racer. Duntov was the perfect man for the job; truly, there was no one else in Detroit in 1954 that could have made Earl’s beauty queen sports car into a fearsome racer. The super-successful C5-R, C6.R, and C7.R Corvette Racing Team owes it all to Zora Arkus-Duntov – and a ton of work.
Duntov’s serious work began late in 1955, and by February 1956 at Daytona Beach, his trio modified 1956 Corvettes set speed records. From there it was a class win at Sebring and “Bring on the hay bales!” 1957 saw the introduction of the 283 Fuelie and the first of a long series of RPO “Racer Kit” Chevrolet-engineered parts for racing Corvettes. Zora wanted to take a team of Corvette SS Racers to Le Mans in 1957 but the AMA Racing Ban stopped him.
Take a test drive with Zora!
By the late 1950s, thanks to the parts Duntov and engineer Mauri Rose developed for the RPO program, privateer Corvette racers were winning championships. Then, closing out the C1 generation, the Grady Davis Gulf One Corvettes took the 1961 SCCA B/Production and the 1962 A/Production Championships. To jump-start the C2 Sting Ray, Duntov launched the now-legendary RPO Z06 racer kit and the Grand Sport Corvette. Again, Zora wanted to take a team Grand Sports to Le Mans, but GM’s strict AMA Racing Ban got in the way and only five Grand Sports were built.
Duntov was relentless in pushing performance and created numerous mid-engine Corvettes prototypes. “Brakes” had been troublesome for racing Corvettes since 1956. By 1965, all production Corvettes had 4-wheel disc brakes. When the big-block was introduced in 1965, Chevrolet realized that cubic-inches were the easiest way to more horsepower. By 1967 Duntov introduced the fearsome 427 L88. From 1967-to-1969 only 216 L88 Corvettes were built, and are super valuable today. In 1969 427 ZL-1 was an L88 with an aluminum block, offered L88 power, with small-block weight.
In 1970 Zora released the 350 LT1, best small-block Corvette to that date. From 1970-to-1972 RPO ZR1 was the Racer Kit for small-block racers. And lastly, Zora was responsible for the 1974, customer applied, “Greenwood” widebody kit, available from the Chevrolet Performance Parts catalog. When Duntov retied in December 1974 he had a mid-engine Corvette in the works, but management said, “We’re selling all the Corvettes we can, why to we need a mid-engine Corvette?” Sure, “business is business” but it would have been so cool.
Without Duntov supplying raw performance, even Bill Mitchell’s beautiful Sting Ray wouldn’t have saved the Corvette. The Corvette survived because of racing and Corvettes raced because of Duntov. Therefore, Zora Arkus-Duntov ultimately deserves to title as “Godfather of the Corvette”. – Scott
PS – You can readpervious installments of my “Corvette’s Founding Father Series from the bleelow links:
Chevy’s New “Performance” Model C5 Corvette, the Z06!
Dateline: 10.19.17 – (All images, GM Archives)The arrival of the C5 Z06 was a delicious surprise for Corvette fans at the end of 2000 as the new 2001 models were being announced. It had been 38 years since the first and only RPO Z06 quietly arrived as an expensive Off Road suspension option, designed strictly for racing. Ordering a 1963 Corvette Sting Ray with the Z06 option for street use was pointless because there was no horsepower advantage, as the Z06 option required the same 360-horsepower L84 317 engine that was available on any Sting Ray. There were no special badges or trim to make a Z06-equipped Corvette look unique. No, all the good stuff was in the suspension and brakes. And since only 199 Z06 Corvettes were built in 1963, unless you were into road racing, you didn’t even know about the Z06. Then add in a 38 year gap between 1963 and 2001, and its no wonder that hardly anyone knew what a Z06 was!
For years there’d been a clamoring for a “cheap Vette”, you know, a strippo model void of all the thrills and creature comforts. The “logic” being that if Chevy would just take out all the goodies, the car would be lighter, leaner, and therefore, meaner and cost a bunch less. After the successful launch of the C5 Corvette, Corvette Chief Engineer, Dave Hill and his team seriously considered such a Corvette. The problem was that removing the frills didn’t add up to much an any weight advantage and the price hardly dropped at all. To really make the car cost less, smaller wheels and tires, and a lesser engine were needed. The end result was a Corvette that no one would have wanted. Continue reading “
“For “Off Road” Use Only” was Chevy Code for RACING!
Dateline: 8.12.17 / Photos: WikiCommons, Illustrations by K. Scott Teeters –When I was a wee lad and would see the term, “For Off Road Use Only” I used to think, “Well who drives these cars in the dirt and grass?” What I didn’t understand was that the term is code for “RACING”! Beginning in 1957, Chevrolet’s new general manager, Ed Cole, made the command decision that he would let “customers” carry the Corvette racing mantle by offering Chevrolet-engineered parts, specifically designed for racing, available through the Chevrolet Parts Department.
For decades, Zora Arkus-Duntov has been credited for the implementation of the Corvette “Racer Kits” through the RPO (Regular Production Option) system. Zora was the face of the unofficial Corvette racing effort, but while researching C1 Corvette chassis design, I came across some interesting information in Karl Ludvigsen’s 2014 book, “CORVETTE: America’s Star Spangled Sports Car”. While Duntov was definitely the front man, Ed Cole also charged three-time Indy 500 winner and engineer, Mauri Rose with the development of the Corvette’s RPO parts program. So, the Corvette “Off Road” RPO effort guided by Le Mans racer and class winner, Duntov, AND Mauri Rose, the second man to win the Indy 500 three times (1941, 1947, and 1948)! Pretty cool, huh?
The Racer Kits weren’t a “secret” but unless customers were tuned into racing, most weren’t aware of this special program.In truth, since improvements in suspension and brakes were for racing, customers rarely used them for their street Corvettes. And typically racers used the expensive dual quad or Fuel Injection performance engines. The Racer Kit RPO option program enabled Corvette racers to be seriously competitive in SCCA racing such that by the end of the 1950s, Corvettes were a force to be reckoned with.
Engineer Maurice Olley designed the chassis and suspension of the first Corvette in 1952 and was considered to be the best suspension and chassis engineer in Detroit. It is essential to remember that the Corvette was NOT designed to be a racecar. Continue reading “
Dateline: 6-15-17 – Ken Hazelton’s 1963 Split-Window Coupe Corvette Sting Ray is a unique car. Ken’s Corvette has never been a streetcar. Although born to be a street sports car, this Sting Ray has never been anything but a racecar. Zora Arkus-Duntov was the driving force behind making sure that production Corvettes could be easily turned into competitive racecars. He was famous for saying, “I want my customers to enjoy their Corvette.” Even though he was in the engineering department and not sales and marketing, he thought like a salesman. Duntov’s insistence that Corvette customers had access to Chevrolet engineered parts for racing, created the Corvette’s halo of racing.
Photo Credit: K. Scott Teeters
Unlike any other American automobile, the Corvette was born to be a racer. In 1951 when Harley Earl went to his first sportscar race at Watkins Glen, he saw the raw enthusiasm for the new breed of small cars from Europe – sports cars. Earl was an automotive genius and pioneer, who often saw possibilities where most did not. For the most part, Americans preferred big cars. But Earl reasoned, “Why should the Europeans have all the fun and racing glory? There should be an America sportscar.” The rest, of course, is history. Because “racing” was built into the Corvette’s DNA, the car attracted others that saw potential for greatness. Without men such as Ed Cole, Zora Arkus-Duntov, Mauri Rose, Bill Mitchell, and many others, Continue reading “
Ken Hazelton’s 1963 Split-Window Coupe Corvette Racecar” →
Dateline: 8.30.15 – The original Z06 was Duntov’s “racer kit” for the then-new 1963 Sting Ray. Unlike modern Z06s, there was no flash to the first Z06, it was strictly hardware designed for the racetrack – no badges, special body panels, or designations at all! But considering the official “we don’t race” policy of GM, 199 1963 Fuel Injected Corvettes with heavy-duty brakes and suspension, wasn’t anything in GM’s big picture. But, if you wanted to race your Corvette in ’63, it was everything, and Duntov made sure you got what you needed. Thanks to the SCCA rules that allowed the 2000-pound Cobra to race against the 3100-pound Corvette, even with the Z06 racer kit, the Vette was at a serious disadvantage. Continue reading “
First-Ever 1963 Z06 Corvette Stingray – Dave MacDonald Picks Up, Then Races Z06 #684 At Riverside” →
As a salute the success and rave reviews of the new C7 Z06, my new prints show the original, 1963 Z06, the C5 2001 Z06, the C6 2006 Z06, and the C7 2015 Z06, available in three unique graphic treatments – Brushed Metal, Diazo Blueprint Paper, and Kraft Paper!
The Z06 has worked out to be one of the most interesting stories in Corvette lore. What started out as an obscure “for racers only” RPO option that hardly anyone knew about, has become GM’s flagship performance car. This is nothing less than astonishing. Heck, even General Motors’ CEO Mary Barra just got herself a black-on-black Z06 convertible. I was joking with Doug MacDonald (Dave MacDonald’s brother), “You think the workers might have been a little nervous bolting together The Queen Mary’s Z06? NO PRESSURE, guys! HA!” Kidding aside, it’s good to see that she has good taste!
Up to the end of April 2015 Chevrolet reported 8,206 Z06s sold. That number already beats out the C6 Z06’s best sales year from 2007 when Chevrolet sold 7,760 Z06s. With a total-to-date (as of the end of April 2015) of 31,377 Corvettes built, 2,618 were Z06 models, that’s 26.18% of the 2015 production so far. The plant has a full two more months of figures to announce, as production of the 2015 Corvettes ends on June 22, 2015. (Check out the 2015 Z06 TV Commercial, click the “Continue reading” link below) Continue reading “BRAVISSIMO! C7 Z06 – NEW Z06 Tribute Art Print”→
Another famous Corvette race car makes THUNDER at RM Monterey!
SPECIAL NOTE – Check out the new Owens Corning Corvette Postage Stamp art print at the bottom of this post!
Well I hope that you were able to catch some auction action, live from Monterey, California.High-end auctions, such as the RM and Mecum events draw some of the finest and most interesting cars in the world. For car lovers, these auctions are the proverbial box of chocolates – you never know what you’re going to get.
Last year at the RM Monterey event there were five delightful Corvettes that went on the block– one stocker, a ‘60 Corvette with just 750 miles on the odometer and four Corvette race cars. For Corvette lovers, the star of last years show was the Greenwood Stars & Stripes 1969 427 ZL1 BF Goodrich racer that sold for $580,000.
This year the RM Monterey auction only had one Corvette and WOW, what’a beauty! Preauction estimates predicted that the car should sell for between $950,000 and $1,350,000! “Auctions” are arguably the ultimate expression of the economic free market. Sellers always have an idea as to how much they want for their cars, but when the gavel comes down, it’s the buyers that set the price. Granted, the economic downturn had depressed the prices of exotic cars over the last few years. Some would call it a price correction to rein in the wildly high prices of just a few years before the downturn.
One interesting factor for the Owens Corning Corvette, as compared to the Greenwood Corvette is the car’s pedigree.The Owens Corning Corvette is the winningest Corvette race car of all time with a staggering 22-straight wins! That’s like winning every race for over two years in today’s American Le Mans Series races. Could the Owens Corning record be broken? Sure, anything is possible. But it’s NOT likely.
Auction action begins at 6:30 Pacific Time for the RM Monterey event.
It’s turning out to be a very interesting weekend for Corvettes at the high-end car auctions, with two big-time events going off at about the same time and area.I checked the RM Auctions website and saw that they have updated their home page and added a “VIEW AUCTION LIVE” link at the top of their homepage. So, they made it easy for us. Auction action starts at 6:60 PM Pacific time (9:30 Eastern Time). If you click the page link before the scheduled start time, all you’ll see is a black box where the streaming video will be. This won’t change until the event starts. After the feed begins, look for the button to Fill Screen, kick back, and enjoy!
For details about this fantastic Corvette racer, just click the image.
If you’re mainly interested in the Owens-Corning 1968 L88 racer, the lot number is 141.The numbering begins with #101, a 1953 Hudson Hornet. So with 40 cars before the Owens-Corning car, it’ll be a few hours before the old war horse Corvette comes thundering upon the stage.
But if you love old cars and racing machines, the auction is a treat.Not only do you get to see the numbers ring up, but before the bidding begins, they describe the car, show photos and videos, as well as letting you get a good look at the car on the turntable. Most of the cars at the RM event are really special and have been lovingly restored and cared for. The marque almost doesn’t matter, they’re just wonderful machines. Continue reading “August Auction Action – Watch RM Monterey and Mecum Monterey, Live!”→
As a salute the success and rave reviews of the new C7 Z06, my new prints show the original, 1963 Z06, the C5 2001 Z06, the C6 2006 Z06, and the C7 2015 Z06, available in three unique graphic treatments – Brushed Metal, Diazo Blueprint Paper, and Kraft Paper!
Up to the end of April 2015 Chevrolet reported 8,206 Z06s sold.
