# Chevrolet Corvette SS

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Not to be confused with [Chevrolet Corvette Super Sport](/source/Chevrolet_Corvette_Super_Sport).

Motor vehicle

Chevrolet Corvette SS Overview Manufacturer Chevrolet (General Motors) Also called XP-64 Production 1957 Designer Clare MacKichan Body and chassis Body style Roadster Layout Front-engine, rear-wheel-drive layout Powertrain Engine 283 cu in (4.6 L) Transmission 4-speed manual Dimensions Wheelbase 92.0 in (2,337 mm) Length 168 in (4,267 mm) Curb weight 1,850 lb (839 kg) Chronology Predecessor Chevrolet Corvette SR-2[1] Successor XP-87 Stingray racer

The **Chevrolet Corvette SS** is a [sports racing car](/source/Sports_car_racing) built by [Chevrolet](/source/Chevrolet) in 1957. The car raced once at the 1957 [12 Hours of Sebring](/source/12_Hours_of_Sebring) before Chevrolet withdrew from all racing activities in response to a ban that year by the [Automobile Manufacturers Association](/source/Automobile_Manufacturers_Association) for all of its member companies, which included GM.

## History

By the mid-1950s GM engineer and future Director of High Performance [Zora Arkus-Duntov](/source/Zora_Arkus-Duntov) was convinced that publicity from Corvette racing victories would increase sales of the car.[2] Duntov took a team of three Corvettes to [Daytona](/source/Daytona_Beach) [Speedweeks](/source/Speedweeks) in February 1956; two cars that were essentially stock and one modified car. [John Fitch](/source/John_Fitch_(racing_driver)) won the Sports Car division in one of the stock Corvettes, and [Betty Skelton](/source/Betty_Skelton) took second place in the other, while Duntov won the Modified Sports Car division in the modified car.[3] Four Corvettes, all with the new SR package and one with additional modifications including an enlarged engine, appeared in the [1956 12 Hours of Sebring](/source/1956_12_Hours_of_Sebring). Duntov declined to participate, so Fitch acted as Team Manager.[4] General Manager of Chevrolet [Ed Cole](/source/Ed_Cole), watching the 1956 Sebring race, realized that only a Corvette built specifically for racing stood a chance of winning against the international competition.[2]: 74[5] Two other racing Corvettes called SR-2s were built, one car for Jerry Earl, son of [Harley Earl](/source/Harley_Earl), the head of GM's Art and Color Section, and a second car for [Bill Mitchell](/source/Bill_Mitchell_(automobile_designer)).[6]

At the [New York Auto Show](/source/New_York_Auto_Show) in December 1956 Chevrolet debuted the 1957 Corvette Super Sport, a show car based on a production Corvette with the latest engine and some features first seen on the SR and SR-2 racing cars.[7][2]: 72

Harley Earl brought Jack Ensley's [Jaguar D-Type](/source/Jaguar_D-Type) into GM's Research Studio.[8][4]: 16 He instructed the team to convert the car to left-hand drive, install a Chevrolet V8 engine, and restyle the car incorporating styling cues from the production Corvette. Work on the D-Type conversion started May 1956.[8] Engineers working on the conversion identified several problems with Earl's idea, leading to the conversion being abandoned, and the project moving in another direction.[9][2]: 74[10]: 32 Some suggest that the entire D-Type episode was a ruse by Earl to get Duntov committed to the project.[4][11]: 26[5]

The redirected project received GM designation XP-64, with approval given in August 1956 to ready two cars to race at Sebring in six months time.[12][13]: 54 The ultimate goal was to race the car in the [24 Hours of Le Mans](/source/24_Hours_of_Le_Mans).[14][15] GM designer [Clare MacKichan](/source/Clare_MacKichan) headed up the team designing the bodywork.[5][2]: 74 Also on the design team were [Robert Cumberford](/source/Robert_Cumberford) and [Anatole Lapine](/source/Anatole_Lapine).[16]: 189[17] Some references include Bob Cadaret in this group.[5] Although the Jaguar was gone, its shape influenced MacKichan's design.[2]: 74

Development of the car's chassis, drivetrain and running gear took place in Duntov's [skunkworks](/source/Skunkworks_project) shop at GM.[5][18] At Lapine's suggestion, a [Mercedes-Benz 300 SL](/source/Mercedes-Benz_300_SL) was obtained, put up on stands and the body removed.[19]: 50–51[11] The Mercedes' chassis was cut and modified to accept a new small-block V8 drivetrain and new rear suspension of Duntov's design.[19]: 49–53 This first chassis was used to create a development mule that would receive a fiberglass body. That frame was also used as a template for building all subsequent SS chassis.[4][20]

The official name for Project XP-64 was the Corvette SS. This was the first Chevrolet to wear the "SS" badge.[21][22] When Cole announced the car, it was described as an engineering project researching various features to improve both performance and safety.[23]

The Corvette SS was Chevrolet's first purpose-built race car.[24] It was considered the successor to the three "SR" cars that raced at 1956 in Sebring, and the two SR-2 Corvettes,[15] which were based on a production Corvette chassis.

Two cars were completed; the development car called the "mule", and a full-spec Corvette SS. Three additional Corvette SS chassis were built, but not turned into complete cars.[23] Some references report that Mitchell later bought the complete development mule for just US$1 as the base for his Stingray racer.[25] In interviews Shinoda and Mitchell both describe Mitchell buying a spare SS chassis for US$500.[26] He estimated the value of the chassis at US$500,000.[27]

After its career ended, the Corvette SS remained in storage at various locations within GM until Duntov convinced [John DeLorean](/source/John_DeLorean), Chevrolet's new general manager, to donate the car to the [Indianapolis Motor Speedway](/source/Indianapolis_Motor_Speedway).[28]

In 2006 a plan was made to apply the Corvette SS name to a special version of the [C6 Corvette](/source/Chevrolet_Corvette_(C6)).[21] This enhanced Corvette was eventually released as the Corvette ZR1.

In late February 2025, the Corvette SS was sold at auction by [RM Sotheby's](/source/RM_Sotheby's) in Miami, Florida for US$7.7 Million, making it the highest ever sale price for a Corvette to date. This was double the previous record of US$3.85 Million set for an L88-powered 1967 C2 Corvette set in August 2024.[29][30]

## Features

The chassis for the Corvette SS is a tubular steel space-frame unit inspired by that of the Mercedes-Benz 300 SL.[16]: 189

The full-spec car has a body made of magnesium, rather than the fiberglass used by production Corvettes.[31] The mule had a fiberglass body. A transparent bubble top was also produced for the car, but was not used when racing.[32]

Front suspension is by short-long arms with coil springs over tubular shock absorbers. At the rear is a [De Dion tube](/source/De_Dion_tube) with two pairs of trailing arms and coil over shocks.

The engine in the Corvette SS is a production [Chevrolet small block](/source/Chevrolet_small-block_engine_(first-_and_second-generation)) [V8](/source/V8_engine) that displaces 283 cu in (4,640 cc).[8] It is fitted with [Rochester Ramjet](/source/Rochester_Ramjet) fuel injection. 9.0:1 compression aluminum cylinder heads and a deep-sump oil pan made of magnesium are used.[23] The camshaft is a special “Duntov” profile solid-lifter piece. The exhaust system uses the 40 in (1,016 mm) tuned-length headers developed for the SR2.[23] Power output is 310 hp (231.2 kW) and 295 lb⋅ft (400.0 N⋅m).

The transmission is a close ratio four-speed [Borg Warner](/source/Borg_Warner) [manual](/source/Manual_transmission) with an aluminum alloy case.[23][4]

The differential is a Halibrand quick-change unit. Depending on the gearset installed, top speed is between 143 and 180 mph (230.1 and 289.7 km/h).[4]

The brakes are twin-leading-shoe Center-Plane mechanisms from Chrysler with a custom GM designed Al-Fin drum made up of an iron face and inner surface and finned aluminum cover. Heat transfer was increased by flowing aluminum through over 100 holes drilled in the iron drum.[23] The brakes are inboard at the rear.[23]

Overall weight for the complete car is 1,850 lb (839.1 kg).[33]

## Technical data

Chevrolet Corvette SS: Detail[4] Engine: Chevrolet small-block V8 Displacement: 283 cu in (4,640 cc) Bore × Stroke: 3.875 in × 3.000 in (98 mm × 76 mm) Maximum power: 310 hp (231.2 kW) at 6000 rpm Maximum torque: 295 ft⋅lb (400.0 N⋅m) at 4400 rpm Compression ratio: 9.0:1 (11.0:1 optional) Valvetrain: Single cam-in-block, pushrods, 2 overhead valves per cylinder Induction: Rochester constant-flow mechanical fuel-injection Cooling: Water-cooled Transmission: 4-speed manual Differential: Halibrand quick-change Steering: Saginaw recirculating ball — 2.5 turns lock-to-lock Brakes f/r: Drum/drum Suspension front: Short-long arms (SLA) with coil springs over tubular Delco shock absorbers, anti-roll bar Suspension rear: De Dion tube, four trailing arms, coil springs over tubular Delco shock absorbers Body/Chassis: Magnesium body (fiberglass body on development mule) Tubular steel space frame chassis Track f/r: 51.5 / 51.5 in (1,308 / 1,308 mm) Wheelbase: 92 in (2,337 mm) Wheels: Halibrand cast magnesium, 5.00-15 with knock-off hubs Tires f/r: Firestone Super Sports 6.50-15/7.60-15 Length Width Height: 168 in (4,267 mm) ——— 48.7 in (1,237 mm) Weight: 1,850 lb (839.1 kg) Maximum speed:

## Motorsports

Duntov had originally signed [Juan Manuel Fangio](/source/Juan_Manuel_Fangio) and [Carroll Shelby](/source/Carroll_Shelby) to drive the car at Sebring in 1957, but both asked to be released from their contracts, so Fitch and [Piero Taruffi](/source/Piero_Taruffi) were substituted on short notice.[4] In practice, and driving the mule rather than the full-spec SS, Fitch managed a lap time of 3:32, while Taruffi turned in a time of 3:35 in the same car. Duntov persuaded both [Stirling Moss](/source/Stirling_Moss) and Fangio to try the mule in practice, and they turned in times of 3:28.2 and 3:27.2 respectively.[34][35][4] Late Friday Fitch did a few laps in the magnesium-bodied SS, and found that while the fiberglass body of the mule insulated the driver from heat produced by the engine, the magnesium body provided no such protection, allowing the heat into the interior unimpeded. He also encountered problems with the brakes on the car. Parts from the mule were swapped over to the SS.

For the race, the starting grid was determined by engine displacement, so the SS started in the number one position. Fitch was in the car for the Le Mans start. After the third lap he pitted to have two front tires replaced, then turned in a lap time of 3:29.8; the fastest lap the SS would achieve. Fitch later pitted to have first a coil wire, then the coil itself, replaced. The car began to overheat. Then the bushings tying the rear lower trailing arms to the chassis split due to having been installed improperly. Fitch retired the SS after 23 laps.[36]

In April 1957, the [Automobile Manufacturers Association](/source/Automobile_Manufacturers_Association) (AMA) voted to enact a ban on motor racing for all of its member companies, which included GM. The ban went into effect on 1 June, and GM accordingly withdrew the SS from further racing.[37][18] The drivers that had been arranged for the 1957 Le Mans did not learn of the withdrawal until a month and a half after Sebring."[23] For 1958 the [Fédération Internationale de l'Automobile](/source/F%C3%A9d%C3%A9ration_Internationale_de_l'Automobile) (FIA) reduced the maximum displacement limit to 3.0 liters for sports cars, effectively disqualifying the Corvette SS from any future European events.[38]

At the opening of the Daytona Motor Speedway in 1959, Duntov took the SS out on the track and set fastest lap with a speed of 155 mph (249.4 km/h).[39]

## Further reading

- Rudeen, Kenneth (25 March 1957). ["Detroit's Secret Weapon"](https://www.si.com/vault/1957/03/25/599920/detroits-secret-weapon). *Sports Illustrated*.

- "Factory Competition Corvette". *Hot Rod*. June 1957.

- Cooper, Jeff (June 1957). "The Chevy of the Future - Will the Corvette SS Influence the '58 '59 '60 Models?". *Motor Trend*. Vol. 9, no. 6.

- Huntington, Roger (August 1957). "Detroit Goes Grand Prix". *Speed Age*.

- Cumberford, Bob (1957). "the $1.5 Million Sportscar". *Sportscar Quarterly*.

- "Project XP-64 Corvette". *Chevy Action*. November 1974.

- Genat, Robert (19 June 2012). *Chevy SS: The Super Sport Story*. Motorbooks. [ISBN](/source/ISBN_(identifier)) [978-0760342978](https://en.wikipedia.org/wiki/Special:BookSources/978-0760342978).

- Ludvigsen, Karl E. (4 July 2014). *Corvette - America's Star-Spangled Sports Car 1953-1982*. Bentley Publishers. [ISBN](/source/ISBN_(identifier)) [978-0837616599](https://en.wikipedia.org/wiki/Special:BookSources/978-0837616599).

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1. **[^](#cite_ref-c-and-d-apr1967_38-0)** Yates, Brock (April 1967). ["Chevrolet Corvette Grand Sport"](https://www.caranddriver.com/reviews/a15150237/chevrolet-corvette-grand-sport-specialty-file/). *Car and Driver*.

1. **[^](#cite_ref-daytona-announcement_39-0)** ["Chevrolet Unveils 2012 Corvette Daytona Prototype"](https://www.daytonainternationalspeedway.com/Articles/2011/11/Corvette-announcement.aspx). *www.daytonainternationalspeedway.com*. 15 November 2011.

v t e Chevrolet vehicles Established in 1911, a division of General Motors since 1918 Current models Cars Aveo/Optra/Sail Bolt Corvette Malibu XL Menlo Monza/Cruze Onix Pickup trucks Colorado (N. America) Colorado/S10 (S. America) D-Max/S10 Max Montana Silverado/Cheyenne (1500–3500HD) Silverado EV Crossovers/SUVs Blazer Blazer EV Captiva Captiva EV/PHEV Equinox Equinox EV Groove Sonic Spark EUV Suburban Tahoe Tracker Trailblazer (crossover) Trailblazer (SUV) Traverse Trax/Seeker Vans Express Express Max N300/Move N400/Tornado Van Spin Commercial trucks F-series N-series/LCF Silverado (4500HD–6500HD) Former models (by date of introduction)1 1910s 490 Series H Classic Six Light Six Series D Series F Series FA Series FB 1920s Series AA Capitol Series AB National Series AC International Series M Copper-Cooled Superior 1930s Bedford/AC/LQ truck Master Series AD Universal Series AE Independence Series BA Confederate Series CA Eagle Mercury/Standard Six 1940s Advance Design truck AK Series Deluxe Fleetline Fleetmaster Stylemaster 1950s 150 210 Beauville Bel Air Biscayne Brookwood Delray El Camino Impala Kingswood Parkwood Townsman Task Force Yeoman 1960s C10/C15/C20/C30 Camaro Caprice Chevelle Chevy II/Nova 400 Constantia Corvair Greenbrier K5 Blazer Kingswood Kommando Lakewood Opala Parkwood Titan Van 1970s 350/De Ville 1700 2500/3800/4100/Iran/Royale Alto Ascona Bison Bruin Chevair Chevelle Laguna Chevette Commodore El Torro LUV Monte Carlo Monza Rekord Royal San Remo Senator Vega 1980s Aska Astro Beretta Calibra Cavalier Celebrity Citation Corsica D-20 Gemini/Spectrum Kadett/Ipanema Kodiak Metro Monza (Opel) Omega (Opel) S-10 S-10 Blazer Samurai Sprint/Swift Omega (Opel) Sprint Trafic Tracker (Suzuki) 1990s Alero Astra/Urban/Viva Cassia/Esteem CMP/Labo CMV/Damas Combo Corsa/Chevy/Classic Frontera/Rodeo Lumina Lumina APV Matiz Niva Omega Prizm S-10 EV Spark Super Carry Tigra Tracker (Americas) Trans Sport Trooper Vectra Venture Nabira/Zafira 2000s Agile Avalanche Aveo/Kalos/Lova/Sonic City Express Cruze D-Max/T-Series Epica Estate/Lacetti/Nubira/Optra Evanda Forester Grand Vitara Jimny Lumina Coupe Lanos Meriva Sail SSR Tavera Tacuma/Rezzo Tosca Uplander Vitara XL-7 W-Series 2010s Captiva Captiva Sport Celta Cobalt C/E-series Enjoy Grand Vitara Classic HHR Joy Lova RV Lumina Ute Wagon/MW N200 Nexia Orlando Prisma SS Vivant Volt 2020s BrightDrop Beat Bolt EV Bolt EUV Camaro Cruze Impala Malibu Optra (Baojun) Orlando Spark Concept cars Adra Astro I Aveo RS Beat concept Bel Air (2002) Bolt concept Camaro (2006) CERV Cheyenne (2003) Code 130R Corvair Monza GT/SS Groove M3X Miray Orlando concept Niva Concept Sequel S3X SS (2003) T2X Testudo Trax (2007) Triax Tru 140S Volt concept XP-898 Corvette concepts Aerovette Astrovette CERV IV/IV-B Mako Shark Stingray concept XP-819 Z06X ZR2 Related topics List of pickup trucks Chevrolet Europe Chevrolet Performance Super Sport 1Note: in the case of rebadged models, the date indicated refers to when they started to be sold as Chevrolet Category Commons List

v t e Chevrolet Corvette timeline, 1953–present Type 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 3-box coupe C2 C3 C5 Fastback coupe C3 C4 C5 C6 C7 C8 Convertible C1 C2 C3 C4 C5 C6 C7 C8 Performance Fuel Injection Z06 Big Block ZR-1 GS Z06 Z06 Z06 Z06 L84 Big Block LT1 ZR1 ZR1 ZR1 Motorsports Corvette SS Stingray Racer Grand Sport GTP C5-R C6.R C7.R C8.R Z06 GT3.R

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Adapted from the Wikipedia article [Chevrolet Corvette SS](https://en.wikipedia.org/wiki/Chevrolet_Corvette_SS) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Chevrolet_Corvette_SS?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.