- Chevrolet Corvette (C3)
Chevrolet Corvette (C3)
1968 Chevrolet Corvette Convertible
Manufacturer Chevrolet Division
of General Motors
Also called Chevrolet Corvette Stingray (1969–1976) Production 1967–1982 Model years 1968–1982 Assembly St. Louis, Missouri, United States (1968-mid 1981)
Bowling Green, Kentucky, United States (mid 1981-1982)
Predecessor Chevrolet Corvette (C2) Successor Chevrolet Corvette (C4) Class Sports car Body style 2-door convertible
Layout FR layout Engine 305 cu in (5.0 L) LG4 Small-Block V8 (1980)
327 cu in (5.4 L) L75 Small-Block V8 (1968)
327 cu in (5.4 L) L79 Small-Block V8 (1968)
350 cu in (5.7 L) Small-Block V8 (1969)
350 cu in (5.7 L) L46 Small-Block V8 (1969)
350 cu in (5.7 L) ZQ3 Small-Block V8 (1970-1974)
350 cu in (5.7 L) LT-1 Small-Block V8 (1970-1972)
350 cu in (5.7 L) L82 Small-Block V8 (1973-1980)
350 cu in (5.7 L) L48 Small-Block V8 (1975-1980)
350 cu in (5.7 L) L81 Small-Block V8 (1981)
350 cu in (5.7 L) L83 Small-Block V8 (1982)
427 cu in (7.0 L) L36 Big-Block V8 (1968-1969)
427 cu in (7.0 L) L68 Big-Block V8 (1968-1969)
427 cu in (7.0 L) L72 Big-Block V8 (1969)
427 cu in (7.0 L) L71 Big-Block V8 (1968-1969)
427 cu in (7.0 L) L89 Big-Block V8 (1968-1969)
427 cu in (7.0 L) L88 Big-Block V8 (1968-1969)
427 cu in (7.0 L) ZL1 Big-Block V8 (1969)
454 cu in (7.4 L) LS5 Big-Block V8 (1970-1972)
454 cu in (7.4 L) LS6 Big-Block V8 (1971)
454 cu in (7.4 L) LS4 Big-Block V8 (1973-1974)
Transmission 3-spd. manual (1968–1969)
Turbo-Hydramatic 3-spd. auto
4-spd. automatic (1982)
Wheelbase 98.0 in (2,489 mm) Length 185.5 in (4,712 mm) Width 69.0 in (1,753 mm) Height 47.7 in (1,212 mm) Curb weight 3,520 lb (1,600 kg) Designer GM & Chevrolet design staffs
Bill Mitchell chief stylist
The Chevrolet Corvette (C3) is a sports car produced by the Chevrolet division of General Motors for the 1968 through 1982 model years. Corvette chief Zora Arkus-Duntov wanted a striking new Corvette; although engines and chassis components were mostly carried over from the previous generation, its body and interior were new. "Though initially flawed, the 1968 like the 1958, would improve and mature into a car precisely right for its time." The so-called Shark was produced during one of the most troubled periods in America: civil unrest, burgeoning federal guidelines, fuel economy and pollution regulations, oil embargoes, rising fuel and insurance costs, runaway inflation, and a lingering recession. Through it all the third generation Corvette continued to set new sales records with an all-time high of 53,807 produced for the 1979 model year.
- 1 History
- 2 Engines
- 3 Production
- 4 See also
- 5 References
- 6 External links
Mako Shark II Concept
The Corvette C3 was patterned after the Mako Shark II designed by Larry Shinoda. Executed under Bill Mitchell's direction, the Mako II had been initiated in early 1964. Once the mid-engined format was abandoned the Shinoda/Mitchell car was sent to Chevrolet Styling under David Holls, where Harry Haga's studio adopted it for production on the existing Sting Ray chassis. The resulting lower half of the car was much like the Mako II, except for the softer contours. The concept car's name was later changed to Manta Ray. The C3 also adopted the "sugar scoop" roof treatment with vertical back window from the mid-engined concept models designed by the Duntov group. It was intended from the beginning that the rear window and that portion of the roof above the seats–be removable.
The "Shark" has the distinction of being introduced to the motoring public in an unorthodox—and unintended—fashion. GM had tried their best to keep the appearance of the upcoming car a secret, but the release of Mattel's die-cast Hot Wheels line several weeks before the C3's unveiling had a certain version of particular interest to Corvette fans: the "Custom Corvette", a GM-authorized model of the 1968 Corvette.
For 1968, both the Corvette body and interior were completely redesigned. As before, the car was available in either coupe or convertible models, but coupes had new removable roof panels (T-tops) and a removable rear window. A soft folding top was included with convertibles, while an auxiliary hardtop with a glass rear window was offered at additional cost. Included with coupes were hold down straps and a pair of vinyl bags to store the roof panels, and above the luggage area was a rear window stowage tray. The enduring new body's concealed headlights moved into position via a vacuum operated system rather than electrically as on the previous generation, and the new hide-away windshield wipers utilized a problematic vacuum door. The door handles were flush with the top of the doors with a separate release button. "Sting Ray" nameplates were absent on the new 1968 body, but Chevrolet still advertised the car as a Sting Ray. Front fenders had functional engine cooling vents. Side vent windows were eliminated from all models, replaced with "Astro Ventilation", a fresh air circulation system. In the cabin, a large round speedometer and matching tachometer were positioned in front of the driver. Auxiliary gauges were clustered above the forward end of the console and included oil pressure, water temperature, ammeter, fuel gauge, and an analog clock. A fiber-optic system appeared on the console that monitored exterior lights and there was no glove box. The battery was relocated from the engine area to one of three compartments behind the seats to improve weight distribution. New options included a rear window defroster, anti-theft alarm system, bright metal wheel covers, and an AM-FM Stereo radio. All cars ordered with a radio, like the C2 cars, continued to be fitted with chrome-plated ignition shielding covering the distributor to reduce interference.
The chassis was carried over from the second generation models, retaining the fully independent suspension (with minor revisions) and the four-wheel disc brake system. The engine line-up and horsepower ratings were also carried over from the previous year as were the 3 and 4-speed manual transmissions. The new optional Turbo Hydramatic 3-speed automatic transmission (RPO M40) replaced the two-speed Powerglide. The L30, a 327 cu in (5.4 L) small-block V8 engine rated at 300 hp (224 kW) and a 3-speed manual transmission were standard, but only a few hundred 3-speed manual equipped cars were sold. The 4-speed manual was available in M20 wide-ratio or M21 close-ratio transmission versions. The M22 “Rock Crusher”, a heavy duty, close-ratio 4-speed gearbox, was also available for certain applications. The engine line-up included the L79, a 350 hp (261 kW) high performance version of the 327 cu in (5.4 L) small-block. Also available were several variants of the 427 cu in (7.0 L) big-block V8, that taken together made up nearly half the cars. There was the L36, a 390 hp (291 kW) version with a Rochester 4-barrel carburetor; The L68, a 400 hp (298 kW) motor with a Holley triple 2-barrel carb set up (3 X 2 tri-power); The L71, generating 435 hp (324 kW) with a tri-power; The L89 option was the L71 engine but with much lighter aluminum cylinder heads rather than the standard cast iron. Then there was the L88 engine that Chevrolet designed strictly for off-road use (racing), with a published rating of 430 hp (321 kW), but featured a high-capacity 4-barrel carb, aluminum heads, a unique air induction system, and an ultra-high compression ratio (12.5:1). All small block cars had low-profile hoods. All big block cars had domed hoods for additional engine clearance with twin simulated vents and “427” emblems on either side of the dome. The new seven-inch wide steel wheels had F70x15 nylon bias-ply tires standard with either white or red stripe tires optional. Rare options were: L88 engine (80), J56 heavy-duty brakes (81), UA6 alarm system (388), L89 aluminum heads (624).
In 1969, small block engine displacement increased from 327 cu in (5.4 L) to 350 cu in (5.7 L), though output remained the same. All other engines and transmission choices remained unchanged from the previous year, though the L30 base engine was now the ZQ3 and the L79 motor was redesignated the L46. All cars featured 8-inch-wide (200 mm) steel wheels (increased from 7 inches). Tire size remained the same, although this was the first year for optional white lettered tires and the last for red striped tires. Carried over from the previous year were seven available rear axle ratios ranging from 2.73 to 4.56. Standard ratio remained 3.08 with automatic and 3.36 with manual transmission. The optional Positraction rear axle, mandated on many engine/gearbox combinations, was installed on more than 95% of the cars. "Stingray" script nameplates appeared on front fenders, now one word, in contrast to the “Sting Ray” name used previously. Exterior door handles were redesigned so the finger plate would actuate the door, eliminating the separate release button. Backup lights were integrated into the inboard tail lights, headlight washers were added, and front grilles were made all black. Side mounted exhausts and front fender vent trim were options for this year only. On the inside, revised door panels provided additional shoulder room in the C3's tighter cabin and headrests became standard. Steering wheel diameter was reduced from 16 to 15 inches to permit easier entry and exit, the ignition switch was moved from the dash to the steering column, and map pockets were added to the dash area in front of the passenger seat. Accounting for 57% of the cars, coupes with their removable roof panels, began a trend of outselling roadsters. An extended production cycle due to a labor dispute increased '69 volume. This was the last year for the L88 engine and the only year for the ZL1 option, which offered an all aluminum 427 cu in (7.0 L) big-block engine listed at 430 hp (321 kW). Rare options: ZL1 aluminum block (2), J56 heavy-duty brakes (115), L88 engine (116), L89 aluminum heads (390).
Car and Driver magazine wrote in October 1968, “The small-engine Corvettes are marginally faster and extraordinarily civilized. The large-engine Corvettes are extraordinarily fast and marginally civilized.”
In 1970, fender flares were designed into the body contours to reduce wheel-thrown debris damage. New were egg-crate grills with matching front fender side vents and larger squared front directional lamps. The previously round dual exhaust outlets were made larger and rectangular in shape. Interiors were tweaked with redesigned seats and a new deluxe interior option combined wood-grain wood accents and higher-spec carpeting with leather seat surfaces. Positraction rear axle, tinted glass, and a wide-ratio 4-speed manual transmission were now standard. The 350 cu in (5.7 L) base engine (ZQ3) remained at 300 hp (224 kW) and the L46 was again offered as a 350 hp (261 kW) high performance upgrade. New was the LT-1, a 350 cu in (5.7 L) small-block V8 engine delivering a factory rated 370 hp (276 kW). It was a solid lifter motor featuring a forged steel crankshaft, 4-bolt main block, 11:1 compression ratio, impact extruded pistons, high-lift camshaft, low-restriction exhaust, aluminum intake manifold, 4-barrel carburetor, and finned aluminum rocker covers. The new engine, making up less than 8% of production, could not be ordered with air conditioning but was fitted with a domed hood adorned with “LT-1” decals.
Motor Trend in May 1970, clocked an LT-1 covering the quarter mile in 14.36 seconds at 101.69 mph and remarked, “There is Corvette and there is Porsche. One is the best engineering effort of America, the other of Germany. The difference in machines is not as great as the disparity in price.”
A special ZR1 package added racing suspension, brakes, stabilizer bars, and other high performance components to LT-1 cars. Big-block selection was down to one engine but displacement increased. The LS5 was a 454 cu in (7.4 L) motor generating 390 hp (291 kW) and accounted for a quarter of the cars. A second big-block, the 460 hp (343 kW) 454 cu in (7.4 L) LS7, was planned and appeared in Chevrolet literature but is not believed to have ever been delivered to retail customers. A short model year resulted in a disproportionately low production volume of 17,316, down nearly 60%. Rare options: ZR1 special engine package (25), shoulder belts in convertibles (475), LT-1 engine (1,287).
1971 cars were virtually identical in appearance to the previous model inside and out. This was the final year for the fiber optics light monitoring system, the headlight washer system, and the M22 heavy duty 4-speed manual gearbox. For the first time, air conditioning was installed on most of the cars, with nearly 53 percent so ordered. Engines were detuned with reduced compression ratios to tolerate lower octane fuel. The small blocks available were the 350 cu in (5.7 L) base engine, which dropped to 270 hp (201 kW), and the high performance LT-1, now listed at 330 hp (246 kW). The LS5 454 cu in (7.4 L) motor was carried over and produced 365 hp (272 kW). Offered in ‘71 only was the LS6 454 cu in (7.4 L) big-block featuring aluminum heads and delivering 425 hp (317 kW), highest of the 1970-72 series, and could be ordered with an automatic transmission. The ZR1 option was carried over for LT-1 equipped cars and the ZR2 option, offered this year only, provided a similar performance equipment package for LS6 cars, and restricted transmission to a 4-speed manual. Rare options: ZR1 special engine package (8), ZR2 special engine package (12), LS6 425-hp engine (188), shoulder belts in convertibles (677).
1972 was the last year for chrome bumpers at both front and rear, the vacuum actuated pop-up windshield wiper door, as well as the removable rear window common to all 1968-72 coupes. The key activated anti-theft alarm system became standard. The increasingly popular choice of an automatic transmission was installed in most corvettes for the first time, with nearly 54 percent so equipped. This year SAE net measurement for horsepower was now utilized (away from the previous SAE gross standard), and was largely responsible for the much lower engine output figures such as the 200 hp (149 kW) rating on the standard 350 cu in (5.7 L) motor. This was the final year for the LT-1 engine, rated at 255 hp (190 kW), and the ZR1 racing package built around it. Although the M22 HD 4-speed was no longer a Regular Production Option, it continued to be fitted to cars outfitted with the ZR1 package. The LT-1 could now be ordered with air conditioning, a combination not permitted the two previous years. The LS5 454 cu in (7.4 L) big block was again available and came in at 270 hp (201 kW). Noteworthy is in ’72 the LS5 was not available to California buyers. This was the beginning of a trend where Chevrolet restricted certain power train choices to Golden State buyers due to that state's practice of applying more stringent emission (smog) standards than mandated by federal regulations. Convertibles were a vanishing breed by ‘72, and the Stingray was no exception. It sold only 6,508 copies, amounting to 9% of the market, placing it number three; it was beaten by the number one-selling Cutlass Supreme, with 11,571, but beat the Impala's 6,456 and the Mustang's 6,401. Rare options: ZR1 special engine package (20), shoulder belts with convertibles (749), LT1 engine option (1,741).
1973 started Corvette's transformation from muscle to touring sports car. A Chevrolet advertisement headlined: "We gave it radials, a quieter ride, guard beams and a nose job." Indeed, redesigned body mounts and radial tires did improve Corvette's ride, and interior sound levels were reduced by 40%. The chrome rear bumper was essentially carried over from the previous year. However, the chrome blade front bumper was dropped for the federally required 5 mph (8.0 km/h) standard for a light-weight front bumper system with an inner transverse tube attached to the frame with two Omark-bolts-(special steel fasteners which absorbed energy when a forming die, pushed back by the bumper, was forced down their length), and an injection-molded urethane bumper cover. The urethane nose was chosen over Chevy's other alternative, a more protruding version of the previous metal bumper. The new urethane bumper assembly added thirty-five pounds to the front end. Two 350 cu in (5.7 L) small block engines were available. The base L-48 engine produced 190 hp (142 kW). The L-82 was introduced as the optional high performance small-block engine (replacing the LT-1 engine) and delivered 250 hp (186 kW). The new hydraulic lifter motor featured a forged steel crankshaft, running in a four-bolt main block, with special rods, impact extruded pistons, a higher lift camshaft, mated to special heads with larger valves running at a higher 9:1 compression, and included finned aluminum valve covers to help dissipate heat. The L-82 was designed to come on strong at higher RPM and ordered with nearly 20% of the cars at a cost of $299.
Car and Driver on the L-82 in December 1972, “…when it comes to making a choice, the L82 is the engine we prefer. Duntov and the other Corvette engineers gravitate toward the big blocks because they like the torque. And granted, the 454s will squirt through traffic with just a feather touch on the gas pedal. But, to us at least, the small block engine contributes to a fine sense of balance in the Corvette that is rare in any GT car, so rare that it would be a shame to exchange it for a few lb.-ft. of torque.”
The 454 cu in (7.4 L) LS-4 big-block V8 engine was offered delivering 275 hp (205 kW) and 15% of the cars were ordered so equipped. “454” emblems adorned the hood of big-block equipped Corvettes. All models featured a new cowl induction domed hood, which pulled air in through a rear hood intake into the engine compartment under full throttle, increasing power (but didn't show up in the horsepower ratings). 0-60 times were reduced by a second while keeping the engine compartment cooler. The new tire size was GR70-15 with white stripes or raised white letters optional. An aluminum wheel option was seen on 1973 and 1974 pilot cars, and a few 1973s were so equipped, but withheld for quality issues, and wouldn't be available until 1976.
Road & Track magazine stated in a 1973 road test: "For all its age, size and compromises, if the Corvette is equipped with the right options it is a pleasant and rewarding car to drive and this 1973 example was one the best Corvettes we've ever driven."
For 1974, a new rear bumper system replaced the squared tail and chrome rear bumper blades introduced in 1968 with a trim, tapering urethane cover carrying an integral license plate holder and recesses for the trademark round taillights. Underneath sat a box-section aluminum impact bar on two Omark-bolt slider brackets similar to the system used in the nose which allowed the Corvette to pass federal five-mph impact tests at the rear as well as the front. The new rear design was quite beautiful, and more up-to-date than the 60's shape that it replaced with the vast majority of enthusiasts embracing the new design. For the 1974 model only, casting limitations mandated left and right bumper covers with a vertical center seam. The anti-theft alarm key activator was moved from the rear panel to the front left fender. Tailpipes were now turned down as the new bumper cover eliminated the tailpipe extensions.
Car and Driver magazine said: "...We think the front and rear together produce a 'molded' shape that speaks of function rather than decor." Chevrolet commented on the new tailpiece in the '74 Corvette sales brochure: “Take the styling. We wouldn’t just change it for the sake of change. But when we made the rear bumper stronger, we made Corvette’s rear styling look different. And, we think better...”
A 1974 Stingray equipped with the L48 195 hp (145 kW) small-block was capable of 0-60 in 6.8 seconds; comparable to the 6.5 second time of the 1968 small-block rated at 300 hp (224 kW); proof the 1972-74 Corvette engines had ample power regardless of reduced horsepower and net (bhp) ratings. The L-82 engine remained at 250 hp (186 kW) and the 454 cu in (7.4 L) LS4 dropped slightly to 270 hp (201 kW).
Hi-Performance Cars magazine in a L48, L82, and LS4 comparison test, September 1973, said: "Our choice for the all-around best performer must go to the base 350 L48 engine...The L48 delivers all the acceleration you'll ever need on the road in a steady, forceful manner...in addition it runs cool, idles smoothly, and can cruise all day at 100 mph (160 km/h). The L48 took 6.8 seconds to reach 60 mph (97 km/h), the L82, 6.7 seconds and the LS4 454, 6.4 seconds. On the Bridgehampton road course and over the ride and handling course at Suffolk County Raceway, the base L48 coupe was again our choice...the L-82 had the same balance as the L48 but if we weren't at the right rpm through a corner, or in the wrong gear, the (L82's) lack of torque made itself felt once again...the L48 was the best balanced of the three." In conclusion, they stated: "The Corvette as a total concept has always been far more than the sum of its individual parts. The fanatical clientele that buys 30,000 of them a year can attest to that. And we'll attest to the fact that after 20 years, the Corvette is more than going strong. It's still the epitome of the American motoring experience." 
Resonators were added to the dual exhaust system on 1974 models which further helped quiet the interior. The radiator and shroud were revised for better low-speed cooling. The inside rear-view mirror width was increased from 8 inches (200 mm) to 10 inches (250 mm). For the first time, lap and shoulder seat belts were integrated, but only in coupes. The FE7 Gymkhana "off-road" suspension included stiffer springs and a stiffer front stabilizer bar with no ordering restrictions. The new $7 FE7 suspension option was included with the Z07 package — The $400 package (also included H.D. power brakes) was available for L82 and LS4 cars with M21 transmission. 1974 was the end of an era for the Corvette with the last true dual exhaust systems, the last without a catalytic converter and the last use of the 454 cu in (7.4 L) big block engine.
Hot Rod magazine in its March 1986 issue selected the 1973-74 Corvette LS6 454 as one of the "10 most collectable muscle cars" in the company of the 1968-70 Chevelle, 1970 'Cuda, 1970 Challenger, 1966-67 Fairlane, 1968-70 AMX, 1970 Camaro Z28, 1968-70 GTO, 1968-69 Charger, and 1967-68 Mustang. The big-block Corvettes were the only muscle cars produced after 1970 worthy of the list.
The 1975 model was advertised as "a more efficient Corvette," as service intervals were extended and electronic ignition and the federally mandated catalytic converter were introduced with "unleaded fuel only" warnings on the fuel gauge and filler door. Dual exhaust pipes were routed to a single converter, then split again leading to dual mufflers and tailpipes. Starting this year, tachometers were electronically driven. The Corvette began to be influenced by the metric system as speedometers now displayed small subfaces indicating kilometers-per-hour. 75's featured revised inner bumper systems with molded front and rear simulated bumper guards. The urethane rear bumper, now in its second year, reappeared as a one-piece seamless unit. This was the final year for Astro Ventilation. Power bottomed out this year — the base engine produced only 165 hp (123 kW) and the only remaining optional motor, the L-82, dropped an astonishing 45 hp (34 kW), managing to deliver 205 hp (153 kW). With no larger engine available, L-82 hood emblems began to appear on cars so equipped. Unchanged was the standard rear axle ratio for the base engine, which remained at 3.08 with automatic and 3.36 with manual transmission. This was the last convertible for the 1968-82 third-generation and only 12% of the cars were ordered as such. As in previous years, a folding top came standard with roadsters and a body color or vinyl covered hardtop was optional at additional cost. Anticipating further federal safety restrictions, Chevrolet believed it would be Corvette's last soft-top model ever but the convertible returned in 1986. Due to the state’s strict emissions standards, this was the last year Chevrolet installed the L-82 engine in a Corvette destined for California.
Car and Driver recorded a respectable 7.7 second 0-60 time in a 1975 base engine-automatic, making the Corvette still one of the fastest cars available at the time. C&D said: "The Corvette feels highly competent with power-everything to help you guide the long body around..."
1976 models featured steel floor panels shielding the catalytic converter exhaust, weighed less than the previous fiberglass floor, and reduced interior noise levels. Horsepower rose to 180 hp (134 kW) for the base L-48 engine; 210 hp (157 kW) for the optional L-82. To further reduce cabin noise levels, cowl induction was dropped in favor of the air cleaner ducted over the radiator, picking up outside air from the front of the car, thus reducing wind turbulence at the base of the windshield. The hood was carried over with its cowl vent grille and induction system non-functional. The optional cast aluminum wheels were finally made available which reduced the unsprung weight of the car by 32 pounds. Nearly 15% of the cars were ordered with the new wheels at a cost of $299. A standard steel rim spare was used. This was the last year for optional white striped tires as 86% of the cars were being delivered with the optional white lettered tires. A new rear nameplate for the rear bumper cover was introduced, eliminating the individual "Corvette" letters used since 1968. An un-welcome change was the "Vega GT" 4-spoke steering wheel, although its smaller diameter did provide extra room and eased entry/exit. The steering wheel, color keyed-to-the-interior, continued on 1977 thorough 1979 models limited to non-tilt wheel cars only. GM's "Freedom" battery, a new sealed and maintenance-free unit was now installed in all cars. The rear window defroster option was changed from the forced air type of previous years to the new "Electro-Clear" defogger, an in-glass heated element type. Even without a convertible model, the Corvette still set new sales records.
Car and Driver recorded 6.8 second 0-60 times in both L-48 and L-82 4-speed equipped 1976 Corvettes. The magazine ordered an L-48 4-speed for a 4,000-mile (6,400 km) road trip to Alaska. C&D summarized: "The Corvette was a big hit–we expected and thoroughly enjoyed that–but we were surprised at how well it withstood the ordeal...once we recovered from the trip we conceded that we'd developed new respect for a car we'd long regarded as something of a put on. In every sense of the word, our Yukon Corvette proved to be tough and we'd have to say that even the production versions impressed us as coming closer to being real touring cars than we might ever have thought. There's a lot more sincere ring now to our stock answer to the question, Why a Corvette?" 
1977 saw the steering column repositioned 2 inches (51 mm) closer to the dashboard to allow a more "arms out" position for the driver. The custom interior with leather seat trim was now standard, with cloth and leather a no cost option. A redesigned center console permitted universal Delco radio options. One consequence of this was an 8-track tape player was now an option. Auxiliary gauges were restyled and the ammeter was replaced with a voltmeter. The sun visors were redesigned to swivel so as to provide some glare protection from the side as well as the front. Chevrolet responded to the criticism of the previous year’s steering wheel with an all new three-spoke leather-wrapped unit, which was well received. Chevrolet featured this new wheel prominently on the front of their new Corvette sales brochure. The new wheel came on all cars fitted with the optional tilt-telescopic steering column which was ordered on all but a few thousand Corvettes. Corvette's refinement as a touring sports car continued as both power steering and power brakes became standard and new options included body-colored sport mirrors, cruise control, and a new convenience group. Cruise control was only available on cars with automatic transmissions. The convenience group included dome light delay, headlight warning buzzer, underhood light, low fuel warning light, interior courtesy lights, and passenger side visor mirror. The black exterior paint color returned (last offered in 1969). Unchanged was the horsepower ratings for both base and L-82 engines. Early in production, the engine paint color was changed from Chevy orange to Corporate blue. The “Stingray” script, seen on front fenders since 1969 disappeared, but new cross-flags emblems began appearing on fenders before the model year ended. Windshield posts were now painted black for a “thin pillar” look and this was the final year of the "sugar scoop" tunneled roof-line and vertical back window. A Corvette milestone was reached during 1977 as Chevrolet had built a half million Corvettes since production began in 1953.
1978 was the Corvette's twenty fifth anniversary, and all 78's featured silver anniversary nose and fuel door emblems. A new fastback rear window was the most dramatic and noticeable styling change, giving the ten-year-old C3 Corvette body style a fresh lease on life. The fixed-glass fastback benefited both aerodynamics and increased the usable luggage space behind the seats while improving rearward visibility in the bargain. A shade was installed that could be pulled forward to cover the rear compartment to protect cargo and carpet against the unrelenting sun. The tachometer and speedometer were redesigned to match the new “aircraft styled” center console and gauge cluster first seen the previous year. Redesigned interior door panels were also new as well as an actual glove box was added in front of the passenger seat, replacing the map pockets of previous years. Available options now included power door locks, a power antenna, dual rear speakers and a CB radio. The optional convenience group, introduced the previous year, now included intermittent (delay) wipers, floor mats, and the passenger side vanity mirror was an upgraded illuminated unit. The base L-48 engine generated 185 hp (138 kW); Those destined for California or high altitude areas produced 175 hp (130 kW). Gone was the chrome-plated ignition shielding over the distributor, replaced with a metal-lined black plastic unit. The single-snorkel air intake used since 1976 was changed to a dual-snorkel set-up on L-82 equipped cars helping to boost that output to 220 hp (164 kW). L-82 engines were also now fitted with an aluminum intake manifold which saved 24 pounds compared to the cast iron unit of previous years. The Corvette converted to metric tires with the P225/70R15 as standard. Wider P255/60R15 tires were available as an option and required fender trimming from the factory for clearance. The fuel tank capacity increased from 17 gal to 24 gal on all cars. To make room for the larger tank, a smaller (P195/80D15) space saver spare tire was utilized.
Two special editions were offered to celebrate Corvette's 25th year. Before he retired, Bill Mitchell had suggested a Silver Anniversary model in his favorite color-silver, appropriately enough-and it appeared as the $399 B2Z option package. The first two-tone paint option offered since 1961, it presented silver over a gray lower body with a separating pinstripe, plus aluminum wheels and dual "sport" outside mirrors as mandatory options, which added another $380 to the cost. 6502 Indy-500 Pace car replica editions were produced featuring Black/silver two-tone paint, front and rear spoilers, mirror-tint roof panels and contoured sport seats. Reviewers praised the car's classic strengths including its impressive straight-line numbers, especially an L48/automatic's 7.8 second 0-60 time and top speed of 123 mph (198 km/h), and noted its more refined, less rattling ride. On the other hand, they continued to note its weaknesses, like a rear-end that tended to step out during sharp maneuvers and a cabin that was still cramped and uncomfortable.
Road & Track took a 1978 L82 to 60 mph (97 km/h) in just 6.6 seconds, 127 mph (204 km/h) flat out, and covered the quarter-mile in 15.3 seconds @ 95 mph.
1979 saw the crossed-flag emblems on the nose and fuel door revert to the those seen on the '77 model. Three popular features introduced on the '78 pace car replicas made it into this year’s production; The new bucket seats, the front and rear spoiler package, and the glass roof panels. The new lightweight “high back” seats were made standard equipment. The new seats had better side bolster, provided easier access to the rear storage area, and the seat pair resulted in a weight reduction of about 24 pounds. The bolt-on front and rear spoilers were offered as an option and nearly 7,000 cars were ordered so equipped. Functionally, the spoilers decreased drag by about 15% and increased fuel economy by about a half-mile per gallon. A bigger hit were the glass mirror-tint roof panels, now a regular option, with nearly 15,000 cars so fitted despite their costing $365. All T-tops were now wired into the standard anti-theft alarm system. Tungsten-halogen high-beam headlights became standard as did an AM-FM radio, and for the first time a cassette tape player could be added as a $234 option. Heavy duty shock absorbers could now be ordered without the full Gymkhana suspension. An auxiliary electric engine cooling fan was first installed, but only on L-82 equipped cars with air conditioning. Rocker panels and rear window trim were painted black. Output for all engines increased due to new "open flow" mufflers. The dual-snorkel air intake introduced on L-82 cars the previous year was now fitted to all cars and the base engine now generated 195 hp (145 kW). The optional L-82 engine increased to 225 hp (168 kW). The M21 close ratio 4-speed transmission continued as an option at no cost but, as in previous years, could only be mated to L-82 engines. The wide ratio 4-speed continued to be available for all cars. Noteworthy is that about 82% of the cars were ordered with manual transmissions in 1968. In '79, less than 20% of the cars were delivered with manual gearboxes. This year reached an all-time high in Corvette popularity. Production hit its peak in 1979 at 53,807, a record that stands to this day.
In 1980, both front and rear bumper covers were restyled with integrated aerodynamic spoilers that resulted in a significant reduction in drag and increased radiator air flow. The hood was also restyled. The crossed-flag emblems disappeared from the front fenders and were revised to a more elongated style on the nose and fuel door. L-82 emblems moved from the hood to the front fenders on cars ordered with the optional high performance engine. This was the finale for the L-82, now producing 230 hp (172 kW) but it could not be mated to a 4-speed, as the manual gearbox was offered only with the base engine. The speedometer in all cars read to a maximum of 85 mph (137 km/h), mandated by a new and controversial federal law. Air conditioning became standard, as did the tilt-telescopic steering column, power windows, exterior sport mirrors, and the convenience group. New was an optional roof panel carrier that would mount to the rear fastback deck. Many weight-saving components were introduced including thinner body panels and an aluminum Dana 44 IRS (Independent Rear Suspension) differential and crossmember. The new lighter unit replaced the arguably stronger cast iron GM 10 bolt IRS differential. In line with further weight savings, the aluminum intake manifold associated with L-82 engines since 1978 was now installed in all cars. For the first time, due to California emission considerations, a unique engine application was installed in cars delivered to that state and was mandatory. This motor was a 305 cu in (5.0 L) V8 engine rated at 180 hp (134 kW), fitted with new tubular stainless steel exhaust manifolds, and mated to an automatic transmission, also mandatory. The carburetor and ignition timing were controlled by Chevrolet’s new Computer Command Control system. The smaller displacement engine was not available in any other state. California buyers were credited $50 as consolation but had to pay for the California emissions certification which was $250. For comparison, the L-48 350 cu in (5.7 L) engine, standard in the other 49 states, was rated at 190 hp (142 kW). The base price increased four times during the model year raising the cost of the car by more than $1,200 to $14,345,24.
In 1981, there was only one powerplant available, a 350 cu in (5.7 L) engine that, like the L-48 base engine the previous year, produced 190 hp (142 kW), but was now designated the L81. The motor was certified in all states and available with manual or automatic transmissions. Chrome air cleaner lids and cast magnesium valve covers dressed up all engines. The stainless steel exhaust manifolds and computer control system introduced on the 305 cu in (5.0 L) California engines the previous year were now standard, as was an auxiliary electric engine cooling fan. This, the last C3 available with a manual transmission, so equipped, had a published 0-60 mph in 8.1 seconds. This model year was the first to use a plastic rear spring, now a Corvette trademark. The spring saved thirty-six pounds, but was limited to base suspensions with automatic transmission. When equipped with Delco's new optional ETR (Electronically Tuned Receiver) radio with digital clock, the quartz analog instrument panel clock was replaced with an oil temperature gauge. The cast aluminum wheels, optional since ’76, were now ordered on 90 percent of the cars at a cost of $428. New options included a power adjustable driver’s seat and power remote outside mirrors. In mid-1981 production shifted from St. Louis, Missouri to Bowling Green, Kentucky, and several two-tone paint options were offered.
1982 saw the debut of the “Cross-Fire Injection” fuel delivery system. This TBI (Throttle Body Fuel Injection) was not the type of fuel injection installed previously in some C1 and C2 Corvettes. It utilized two throttle bodies combined with Chevrolet’s computer control system. The engine produced 200 hp (149 kW) and was mated to a new four-speed automatic transmission with torque converters in the top three gears. Compared to the previous Turbo-Hydramatic 3-speed, the new 700-R4 transmission had a lower first and second gear for improved low-end acceleration, and a fourth gear overdrive that would reduce engine RPM by 30 percent at highway cruising speeds, resulting in better fuel economy. On the downside, the new transmission was not considered a strong unit and proved problematic. The final model C3 Corvette's published performance numbers were 0-60 in 7.9 seconds-the quarter-mile in 16.1 @ 85 mph (137 km/h). This was the last year for 8-track tape availability and new “cross-fire injection” emblems appeared on front fenders. Nose and fuel door crossed-flags emblems changed to a more squared design. Chevrolet knew this would be the last year of an entire generation of Corvettes and so commemorated the occasion by offering a Collector Edition with separate serial number sequencing, silver-beige paint, unique wheels patterned after the 1967 model's bolt-on alloys, and an operable rear hatch window.
For the 1969 model year the ZL1 option was offered featuring an all-aluminum 427 cu in (7.0 L) big-block engine listed at 430 hp (321 kW) gross, it propelled the ZL1 through the 1/4 mile in 12.1 seconds. The option cost $4,700 (the ZL1 was a $3,010 option that consisted of aluminum cylinder block and heads on top of the $1,032.15 L88 option). Though generally believed to deliver at least 100-hp (75 kW) more, this has been proved as only rumors, proper testing of the engine reveled closer to 460 hp (343 kW) gross and net rating of only 376 hp (280 kW).
According to Motor Trend in a late 1968 road test, the Corvette ZL1 was the fastest production car ever produced (up to that time). For decades, automotive experts believed only two were built (yellow and white coupes), however Car and Driver in December 1969, revealed a third red ZL1. It disappeared after that 1969 road test and has never been found.
ZR1 & ZR2 (1970–1972)
The ZR1 special engine package was a $1,221.00 option available exclusively with the LT-1 engine option. It included the solid-lifter small-block engine, heavy-duty four-speed transmission, power brakes, aluminum radiator, and a revised suspension with special springs, shocks, stabilizer bar, and spindle-strut shafts. Since it was competition equipment, the ZR1 could not be ordered with power windows, power steering, air conditioning, a rear-window defogger, wheel covers, or a radio. Only 53 1970-1972 ZR1's were built 
The ZR2 special engine package was a $1,747.00 (1 year only) option originally planned for 1970, but officially released in 1971. It included the special equipment in the ZR1 package, but for the 454 LS-6 engine. Per GM policy, 1971 Corvette engines were detuned to run on low-lead fuel, except for the LS-6 V8, which was rated at 425 bhp (317 kW) on premium fuel. 188 cars in the 1971 model included the LS-6 engine, with only 12 with the ZR-2 package. Some believe the "ZR" lettering to stand for "Zora Racer", named after chief Corvette engineer Zora Duntov, but in 2008, Corvette Production Manager Harlan Charles said, "the reality is the codes are usually random and get meaning from enthusiasts."
Indy 500 pace car (1978)
The Corvette C3 was chosen as the pace car for the 1978 Indianapolis 500. Initially, 2500 Indy 500 replica pacers—100 for each year of production—were scheduled for sale. But it was decided that each of Chevrolet's 6200 dealers should have one for showroom display. Thus what was called the Limited Edition Indy Pace Car Replica Corvette made up some 15 percent of total production. Like the Silver Anniversary model, the Pace Car Replica was actually an option package-RPO Z78. Its main distinction was black over silver metallic with a bright red pinstripe in between with a spoiler added to each end to alter appearance more dramatically. Pace car interiors reflected Bill Mitchell's influence, with full silver leather or silver leather/gray cloth upholstery and gray carpeting. All replicas were equipped with new thin-shell design-lumbar support seats, new glass t-tops, alloy wheels, power windows, air conditioning, tilt/telescope steering wheel, power locks, rear defogger, sport mirrors, heavy-duty battery, and AM/FM stereo with either eight-track tape player or CB radio. The final touch was the Indy 500 decal set included uninstalled with each limited-edition car.
Collector Edition (1982)
The 1982 Collector Edition was the first Corvette with a hatchback rear window, foreshadowing the C4 Corvette. A special color scheme was used inside and out and Collector Edition badges were featured. The special, exclusive aluminum wheels were designed to look like the optional bolt-on wheels of the 1967 model. The Collector Edition had a "0" in the sixth digit of the VIN rather than the "8" found on standard Corvettes. This was the first Corvette to sell for more than $20,000, with a base price of $22,537.59. The Collector Edition had unlimited availability and 6,759 were produced out of a 1982 total production of 25,407.
Engine Year Power 305 in³ "Calif. Only" LG4 V8 1980 180 hp (134 kW) net 327 in³ Small-Block V8 1968 300 hp (224 kW) 1968–1969 350 hp (261 kW) 350 in³ Small-Block V8 1969 300 hp (224 kW) 1970 350 hp (261 kW) 1970–1971 370 hp (276 kW) 1971 270 hp (201 kW) 1971 330 hp (246 kW) 1972 200 hp (149 kW) net 1972 255 hp (190 kW) net 1973 190 hp (142 kW) net 1973–1974 250 hp (186 kW) net 1974 195 hp (145 kW) net 1975 165 hp (123 kW) net 1975 205 hp (153 kW) net 1976–1977 180 hp (134 kW) net 1976–1977 210 hp (157 kW) net 1978 185 hp (138 kW) net 1978 220 hp (164 kW) net 1979 195 hp (145 kW) net 1979 225 hp (168 kW) net 1980–1981 190 hp (142 kW) net 1980 230 hp (172 kW) net 1982 200 hp (149 kW) 427 in³ Big-Block V8 1968–1969 390 hp (291 kW) 1968–1969 400 hp (298 kW) 427 in³ Big-Block Tri-Power V8 1968–1969 435 hp (324 kW) 427 in³ ZL1 aluminum V8 1969 430 hp (321 kW) gross, 376 hp (280 kW) net 454 in³ Big-Block V8 1970 390 hp (291 kW) 1971 365 hp (272 kW) gross, 285 hp (213 kW) net 1971 425 hp (317 kW) 1972, 1974 270 hp (201 kW) net 1973 275 hp (205 kW) net
The C3 fifteen year run shows an extreme contrast. The list price for the Corvette in 1968 was $4,663. By 1982, mostly due to inflation, the base price had increased to $18,290. In 1968 there were six engines, two small-block V8s and four big-block V8s. By 1982 there was only one small block V8 engine available. In '68 there were five transmissions, including four manual choices. By '82 there was one, a four-speed automatic. Although refined, emission standards and fuel economy concerns had changed America's only sports car.
Year Production Base Price Notes 1968 28,566 $4,663 New body and T-top removable roof panels, new interior, engines carried over, three-speed Turbo Hydra-matic replaces two-speed Powerglide as automatic transmission option 1969 38,462 $4,780 First year of the 350 in³ Small-Block; longer model year extended to December, 1969 due to delay in introduction of 1970 model; "Stingray" front fender nameplates added, new interior door panels and inserts, 17-inch black-vinyl steering wheel (replaced 18-inch wood-rim wheel) 1970 17,316 $5,192 First year for the LT-1 Small-Block and 454 in³ Big-Block; three-speed manual transmission dropped and four-speed manual became standard with Turbo Hydra-matic available as no-cost option with all engines except LT-1 350; posi-traction made standard equipment; introduced along with all-new second-generation Chevrolet Camaro on Feb. 26, 1970, new egg-grate metal front grills and fender grills, lower molded fender flares, new hi-back seats & interior trim, new custom interior option includes:leather seat trim, cut-pile carpeting, lower-carpeted door panels & wood-grain accents. 1971 21,801 $5,496 Significant horsepower drops due to reduced compression ratios to meet GM corporate edict requiring all engines to run low-octane unleaded gasoline; horsepower ratings based on both "gross" and "net" figures with the former based on engine hooked to dynometer while "net" ratings based on horsepower as installed in vehicle with accessories and emission controls installed. 1972 27,004 $5,533 Horsepower ratings now advertised in SAE net figures, last year for LT-1 engine, front & rear chrome bumpers & removable rear window, last year for windshield wiper door. 1973 30,464 $5,561 5 mph front bumper system with urethane cover, pot-metal front grills (black with silver edges), chrome rear bumpers unchanged, new design front fender ducts, first year for radial tires (standard equipment), rubber body mounts, new hood with rear air induction & under-hood insulation, new front-end (round) emblem. 1974 37,502 $6,001 5 mph rear bumper system with urethane cover to match last year's front bumper, new recessed tail lamps and down-turned tail-pipes. 1974 is the only year with two piece rear bumper cover with center-split. No gas lid emblem was used. Aluminum front grills (all-black), new dual exhaust resonators, revised radiator cooling and interior a/c ducts, integrated seat /shoulder belts in Coupe. Last year for true dual exhaust, last year for big-block engine in a Corvette. 1975 38,645 $6,810 First year of Catalytic converter & single-exhaust, black (painted) bumper pads front & rear, redesigned inner-bumper systems & one-piece rear bumper cover, plastic front grills (all-black), amber parking lamp lenses (replaced clear lenses on 73-74) new emblems, last year of C3 convertible. 1976 46,558 $7,604 First-year for steel floor-panels, cold-air induction dropped, new aluminum alloy wheels option, new one-piece rear "Corvette" nameplate (replaces letters), last year of "Stingray" fender nameplates. 1977 49,213 $8,647 Black exterior available (last year-1969), new design ""Corvette flags" front end & fender emblems. New interior console and gauges, universal GM radios. 1978 46,776 $9,750 New fastback rear window, Silver Anniversary and Indy 500 Pace Car special editions; Pace-car included sport seats & spoilers-front & rear, limited option-glass t-tops; redesigned interior, dash and instruments. 1979 53,807 $10,220 Sport seats (from previous year pace-car); front & rear spoilers optional, glass t-tops optional; New interior comfort features; highest Corvette sales year to date. 1980 40,614 $13,140 Lightened materials, new hood, front end with molded spoilers, rear bumper cover with molded spoiler and new tail lamps, Federal government required 85 mph (137 km/h) speedometer; California cars powered by 305 V8 and automatic transmission for this year only, last year for L-82 engine - (n/a with manual transmission) 1981 40,606 $16,258 Production is switched from St. Louis to new Bowling Green plant; 350 V8 returns in California cars, last year for manual transmission. 1982 25,407 $18,290 New cross-fire fuel-injected L83, New automatic overdrive transmission; Collectors Edition features exclusive hatch rear window - is one fourth of production. Total 542,741
- ^ quoted from Collectible Automobile-August 1996
- ^ The Corvette Black Book-2009 edition-p.56-84
- ^ Corvette 50th Anniversary by the Auto Editors of Consumer Guide
- ^ a b c d e f g h i j k l m n o p q Corvette Black Book 1953-2009
- ^ 1969 Chevrolet Corvette sales brochure
- ^ NCRS 1968-1982 Corvette Specifications Guide
- ^ Motor Trend magazine, May 1970, “Comparison: 1970 Chevrolet Corvette LT-1 vs 1970 Porsche 911E”
- ^ Flory, J. "Kelly", Jr. American Cars 1960-1972 (Jefferson, NC: McFarland & Coy, 2004), p.734.
- ^ 1968-1972 Corvette brochures
- ^ Corvette Black Book 1953-2011
- ^ NCRS 1968-1982 Corvette Specifications Guide
- ^ Corvette Black Book 1953-2011
- ^ Flory, p.864.
- ^ a b Flory, p.865.
- ^ a b 1973 Chevrolet Corvette advertisement
- ^ Chevrolet 1974 Corvette sales brochure
- ^ Car and Driver magazine, December 1972, “1973 Chevrolet Corvette - Road Test”
- ^ 1974 Chevrolet Corvette sales brochure
- ^ a b High Performance Cars-September 1973
- ^ Corvette 50th Anniversary by the Editors of Consumer Guide
- ^ Corvette Black Book-2009
- ^ Hot Rod-March 1986
- ^ 1975 Chevrolet Corvette advertisement
- ^ Corvette Black Book 1953-2009)
- ^ NCRS 1968 to 1982 Corvette Specifications Guide
- ^ Car & Driver-May 1975
- ^ Corvette Black Book 1953-2011
- ^ Corvette Black Book 1953-2011
- ^ Corvette Black Book 1953-2011
- ^ Car & Driver-February, March 1976
- ^ NCRS 1975-1977 Corvette Technical Information Manual and Judging Guide
- ^ a b Corvette 1968-1982 Source Book, Arthur A.C. Steffen
- ^ Road & Track Road Test Annual 1979
- ^ Corvette Black Book 1953-2009.
- ^ Corvette Restoration Guide 1968-1982 by Richard Prince
- ^ a b Sabatini, Jeff (2006-11-05). "That '70s 'Vette: Just Another Girly Car?". The New York Times. http://www.nytimes.com/2006/11/05/automobiles/05SPIN.html?_r=1&oref=login. Retrieved 2010-04-28.
- ^ 1980 Chevrolet Corvette Sales Brochure
- ^ Hot Rod Magazine, Feb 09, “700 R4 Transmission - Overdrive Evolution”
- ^ 1978-1982 Corvette brochures
- ^ Sabatini, Jeff (2006-11-05). "That ’70s ’Vette: Just Another Girly Car?". nytimes.com. http://www.nytimes.com/2006/11/05/automobiles/05SPIN.html?_r=2&oref=login%20NY%20Times. Retrieved 2009-12-25.
- ^ "Corvette Statistics". rowleycorvette.com. http://www.rowleycorvette.com/stats69.html. Retrieved 2009-12-25.
- ^ by the Auto Editors of Consumer Guide (2007-06-07). "1971 Corvette". Auto.howstuffworks.com. http://auto.howstuffworks.com/1971-corvette.htm. Retrieved 2010-10-05.
- ^ "1970 ZR-2 Corvette". Titanbrammer.com. http://www.titanbrammer.com/. Retrieved 2010-10-05.
- ^ "2001 Corvette - Historical Background". Corvettemuseum.com. 1962-10-13. http://corvettemuseum.com/specs/2001/hist.htm. Retrieved 2010-10-05.
- ^ "1978 Corvette Pace Car". Mathewscollection.com. http://www.mathewscollection.com/corvette/Corvette_78_Coupe_Pace.htm. Retrieved 2010-10-05.
- ^ "CRG Research Report on ZL1". http://www.camaros.org/copo.shtml. Retrieved 2011-10-22.
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