Chevrolet Corvette C3 — the Shark-Bodied Corvette, 1968 to 1982

Chevrolet Corvette C3 at a glance

The generation before it is described in our Corvette C2 Sting Ray guide, and the story of all eight generations is in the history of the Chevrolet Corvette.

From Mako Shark II to showroom

Work on the Mako Shark II show car began in early 1964. Larry Shinoda shaped it under GM's styling chief Bill Mitchell, and the original idea was a mid-engined car. When that layout was dropped, Henry Haga's studio adapted the design to the existing front-engined Sting Ray chassis. The tunnelled "sugar scoop" roof with a near-vertical rear window was borrowed from mid-engine studies by the engineering group of Zora Arkus-Duntov.

The production car kept the concept's sharp beltline, bulging front wings and hidden headlamps, now raised and lowered by vacuum. A curious leak came from a toy: Mattel's Hot Wheels "Custom Corvette" reached shops several weeks before Chevrolet unveiled the real car. Early build quality was a weak point. Hagerty notes first-year problems, yet more than 28,000 buyers took a 1968 model anyway.

Duntov remained chief engineer until 1975, when Dave McLellan took over. Over its life the car moved through three internal platform codes: Series 194 (1968–1971), Series Z (1972–1975) and Series Y (1976–1982).

Body, roof and a changing nose

The 1968 coupé introduced removable T-top roof panels, which made it an open car without the weight of a full convertible. Up to 1972 the rear window could also be taken out. The convertible had a folding soft top and an optional hardtop, but demand faded: only 12 % of 1975 cars were ordered open, and that was the last C3 convertible.

Federal bumper rules reshaped the car. For 1973 the chrome front bumper gave way to a body-coloured urethane nose designed to absorb 5 mph impacts, adding about 16 kg. A matching urethane tail with an aluminium impact bar followed in 1974. For 1978, the 25th anniversary year, a large curved fastback window replaced the sugar-scoop roof and the fuel tank grew from 17 to 24 US gallons (about 64 to 91 litres). New front and rear fascias with integrated spoilers arrived for 1980, and the final 1982 Collector Edition gained an opening glass hatch.

Engines: from big block to Cross-Fire Injection

In 1968 buyers could choose between six V8s, two small blocks and four big blocks. By 1982 a single small block remained. The figures below are Chevrolet's ratings as listed by Wikipedia: SAE gross up to 1970, both gross and net for 1971, and SAE net from 1972. A net figure is measured with the full exhaust and accessories fitted, so it is always lower than a gross figure for the same engine.

The L88 was a thinly disguised racing engine with aluminium heads, a 12.5:1 compression ratio and a large four-barrel carburettor; only 80 were fitted in 1968. Lower compression for low-lead fuel arrived in 1971, catalytic converters in 1975. The big-block 454 disappeared after 1974, together with true dual exhausts. In 1980 Californian cars received a 305 cu in (5.0 l) V8 with 134 kW (180 hp), and the 1982 L83 brought throttle-body fuel injection, which GM called Cross-Fire Injection. To translate old gross and net figures into other units, use the 1cars power converter.

Gearboxes changed with the market. In 1968 the three-speed Turbo Hydra-matic replaced the old two-speed Powerglide, and about 82 % of buyers still chose a manual. By 1979 fewer than 20 % did. The four-speed manual was last offered in 1981, and every 1982 car had the new four-speed 700-R4 automatic with overdrive, a unit Wikipedia describes as troublesome.

Year by year: what changed

• 1969: The small block grew from 327 to 350 cu in, and the Stingray name returned as one word. A labour dispute stretched production into December. GM leased three Stingrays to the Apollo 12 astronauts for one dollar a year each.
• 1970: Flared wheel arches, egg-crate grilles and the high-revving LT-1. Output fell to 17,316 cars, the lowest since 1962.
• 1971: Compression ratios dropped so the engines could run on lower-octane fuel; air conditioning was fitted to about 53 % of cars.
• 1972: Last chrome bumpers, last removable rear window and the first SAE net ratings.
• 1973–1974: Urethane bumpers, standard radial tyres and the L82 small block in place of the LT-1.
• 1975: Catalytic converter, electronic ignition and the last convertible.
• 1976–1977: Steel floor panels, optional aluminium wheels and, in 1977, standard power steering and brakes. That year Chevrolet passed half a million Corvettes since 1953.
• 1978: Fastback glass, the Silver Anniversary paint option and 6,502 Indianapolis 500 Pace Car replicas.
• 1979: Optional spoilers that cut drag by about 15 %, glass roof panels on nearly 15,000 cars and the all-time sales record.
• 1980–1981: A diet with an aluminium rear differential, thinner panels and, in 1981, a composite rear leaf spring that saved 16 kg. Production moved to Bowling Green in mid-1981.
• 1982: Cross-Fire Injection, automatic only, and the Collector Edition.

Production and prices by model year

Chevrolet's US base price climbed almost fourfold during the C3's life. The figures are the original sticker prices in US dollars for the base car, as listed by Wikipedia; they are not adjusted for inflation.

The 1979 total of 53,807 remains the best single year in Corvette history. By our calculation, the C3 averaged about 36,000 cars a year, around half as many again as the C2 managed in its five seasons.

Acceleration and top speed in period tests

Road tests show how much the emissions era cost. A 1968 small-block car reached 60 mph in about 6.5 seconds. Motor Trend timed a 1970 LT-1 over the quarter mile in 14.36 seconds at 101.69 mph. By 1975 Car and Driver needed 7.7 seconds to 60 mph in a base automatic.

The later cars were not slow by the standards of their day. Road & Track timed a 1978 L82 at 6.6 seconds to 60 mph and 15.3 seconds over the quarter mile, and the car reached 204 km/h (127 mph). The last 1982 car needed 7.9 seconds to 60 mph. Car and Driver summed up the early choice in October 1968: the small-engine Corvettes were "marginally faster and extraordinarily civilized".

Special versions and rare cars

The 1982 Collector Edition cost US$22,537.59 and was the first Corvette to pass US$20,000. Its sixth VIN digit is "0" instead of "8", which helps to spot copies. At the top of the market, a lightweight 1969 L88 sold at Barrett-Jackson in January 2014 for US$2.86 million, and one of the factory ZL1 cars fetched US$3.14 million at RM Sotheby's in Arizona in 2023.

Buying a C3 today: reliability and what to check

Mechanically the C3 is simple: a pushrod V8, a conventional gearbox and parts shared with other GM cars, so routine maintenance and service are within reach of any classic specialist. Reliability problems usually come from age and neglect rather than design. Classic Motorsports advised buyers in 2021 to treat condition as more important than originality, especially on later cars. Its main warnings:

• Frame and "birdcage": dried T-top seals let water reach the steel structure. Owners also report rust in the birdcage around the cabin and at the frame kick-up ahead of the rear wheels, sometimes hidden under fresh underseal.
• Vacuum system: the hidden headlamps and the wiper door are vacuum-operated, and leaks can take a long time to trace.
• Bumpers: the urethane ends crack with age; many have been replaced by fibreglass copies that look almost the same.
• Fit: drivers taller than about 1.88 m (6 ft 2 in) may find the cabin tight. Seats were reshaped for wider drivers in the late 1970s.

Which C3 to choose depends on use. Chrome-bumper cars from 1968–1972 are the most sought after and the most expensive, with documented big-block and LT-1 cars at the top. The 1978–1982 cars have more room, a fastback window and better comfort. Classic Motorsports singles out the 1979 as a good-value buy because so many were made. Parts supply and club knowledge are excellent across the range. To weigh a C3 against a later Corvette or a European rival, put both cars into the 1cars comparison tool; more American classics are collected in the 1cars classics section.

Legacy

The C3 carried the Corvette through its most difficult decade. It began with 324 kW big blocks and ended with a 149 kW fuel-injected small block, yet sales rose almost every year. Its shape stayed in production longer than any other Corvette design, and its replacement, the 1984 C4, finally brought a new chassis. The brand's other generations and specifications are listed on the Chevrolet Corvette catalogue page.

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