C4 Corvette specs by year (1984–1996): engines, horsepower, weight, 0–60 and more

Every C4 engine displaces 5.7 liters (350 cu in), and every rating here is GM’s, in SAE net horsepower (its 1985 power-team page cites the SAE J1349 net standard). Five engines cover the run, and the L98’s rating changed almost every year:

Sources: GM Heritage Center kits, 1984, page 25; 1985, page 61; 1986, page 18; 1987, page 43; 1988, page 40; 1989, page 138; 1990, page 52; 1991, pages 17 and 18; 1992, page 20 and page 171 (LT5); 1993, page 110; 1994, page 90; 1995, page 16; 1996, page 42. RPO is GM’s regular production option code.

Why the L98 has two ratings. The 5 hp gap came from the mufflers in 1988 and 1989, from the sport exhaust (on six-speed or 3.07-axle coupes) in 1990, and from the gearbox or axle in 1991. Check a 1988–1991 car’s body, gearbox and axle before quoting its figure; the 1988, 1990 and 1991 guides give each year’s combinations.

The LT1’s torque moves by document. GM printed 330 lb-ft at 4,000 rpm for 1992, 340 at 3,600 for 1993 and 1994, 340 at 4,000 on its 1995 chart and 335 at 4,000 for the automatic-only 1996 LT1. The 1993 gain is real: GM credits a shorter intake duration (1993 kit, page 110). The rpm wandering after that is paperwork; the 1996 guide notes one more GM sheet with a different peak.

More from GM’s engine pages:

• Bore and stroke: 4.00 x 3.48 in for the L83, L98, LT1 and LT4; 3.90 x 3.66 in for the LT5 (1993 owner’s manual, page 314; 1996 owner’s manual, page 305).
• Redline: 5,700 rpm for the LT1 and 7,200 rpm for the LT5 (1995 kit, page 16); 6,300 rpm for the LT4, on an 8,000 rpm tachometer (1996 kit, page 30).
• Firing order: 1-8-4-3-6-5-7-2 (1993 owner’s manual, page 314).
• Which engine is it? The eighth character of the VIN: 8 for the 1984–1991 L83 and L98, P for the LT1, 5 for the LT4 and J for the ZR-1’s LT5 (1985 kit, page 6; 1994 owner’s manual, page 225; 1996 owner’s manual, page 305).

The ZR-1’s LT5 was an aluminum, four-cam, 32-valve V8 built by Mercury Marine; the C4 ZR-1 guide has its story, valet key included. The Callaway Twin-Turbo (RPO B2K), a dealer-ordered option from 1987 to 1991, carried Callaway’s ratings, not GM’s; the 1987 guide covers it.

Two automatics and two manuals, with GM’s ratios:

Sources: GM Heritage Center kits, 1984, pages 31 and 32; 1989, page 39; 1990, page 22; 1994, pages 96 and 138; 1995, page 16; 1996, page 42.

Two sets of six-speed ratios. The 2.68 set is on GM’s 1989–1993 pages, its 1994 press table and the transmission text in the 1995 and 1996 kits. The 2.64 set (reverse 2.42) first shows up on GM’s 1994 specification form, issued in September 1993, then on the 1995 and 1996 spec charts. GM never said it changed the ratios, so both are shown. And when the lever goes from first straight to fourth under light throttle, that’s the six-speed’s computer-aided gear selection at work, not a fault.

Sources: GM Heritage Center kits, 1984, page 32; 1985, page 61; 1988, page 54; 1989, page 142; 1990, page 42; 1991, page 17; 1992, page 20; 1995, page 16; 1996, page 42.

Every C4 has a limited-slip differential. G92 is GM’s performance axle option, and Z51 one of its handling packages. A higher number means quicker acceleration and more revs at cruise. The 1989 guide has more on that year’s disputed manual axle.

A base C4 weighs 3,164 lb (a 1984 manual coupe) to 3,383 lb (a 1993 convertible) by GM’s curb weights, and a ZR-1 adds about 190 to 225 lb. The figures come from the industry-standard MVMA specification forms GM filled in each year, or its own spec pages where those are the better record:

Sources: GM Heritage Center kits, 1984, page 48; 1985, page 84; 1986, page 48; 1987, page 66; 1988, page 54; 1989, page 166; 1990, page 51; 1991, page 51; 1992, page 206; 1993, page 109; 1994, page 33 and page 8 (the ZR-1 sheet); 1995, page 158; 1996, page 41.

Curb weight, in GM’s words. “The calculated weight of a vehicle with standard equipment,” with oil, lubricants, coolant and fuel filled to capacity (1989 kit, page 166); from 1992 the forms cite SAE J1100, the engineering standard. It’s calculated for a base car, so options add weight; the 1984 figures were even worked out on the 15-inch wheels no 1984 got (the required 16-inch package added 34.4 lb). Shipping weight, on the same forms, is curb weight with only 3 gallons of fuel: 106 lb less on GM’s 1990s forms.

The 1992 and 1995 trap. Twice, GM printed a shipping weight where the curb weight belonged. For 1992, its spec sheet calls 3,223 lb the coupe’s curb weight and 3,269 lb the convertible’s (its product information book says 3,223 too), but the MVMA form in the same kit lists exactly those figures as shipping weights, with curb weights of 3,327 and 3,375 lb. For 1995, GM’s own kilogram and axle figures for the coupe add up to 3,309 lb; the 3,203 lb it prints on the same form, in the dealer book and on its June 1994 chart is the coupe’s shipping weight. The 1992 and 1995 guides use the curb weights too, so a 3,223 lb 1992 or a 3,203 lb 1995 is a shipping weight.

GM’s 1985–1989 dealer spec pages carry “approximate” weights from year to year (3,225 lb automatic, 3,216 lb manual, in four kits), so the table uses the MVMA forms. By this site’s arithmetic, a ZR-1 weighed 224 lb more than a base coupe in 1990 and 186 lb more in 1994. GM puts the weight 51/49 front to rear on a coupe and 50/50 on a convertible (1992 kit, page 20).

Test cars on Car and Driver’s scales: a 1984 automatic coupe at 3,300 lb, a 1986 automatic convertible at 3,266 lb, a 1988 Z52 automatic coupe (opens in new tab) at 3,313 lb, a 1989 six-speed convertible carrying its new hardtop at 3,499 lb, a 1990 Z51 six-speed coupe at 3,380 lb, and ZR-1s at 3,527 lb (1990) and 3,529 lb (1993). Those cars carried options; they aren’t GM figures.

GM’s papers give no top speed for any C4: none of the 13 Heritage Center kits holds one. Its own 0–60 times are few, and all but one are for 1992. For the LT1, its spec sheet gives 4.92 s six-speed, 5.26 s automatic. The magazines filled the gap.

GM’s own C4 0–60 times

Sources: 1992 kit, page 20 and page 111; 1996 kit, page 17.

Treat the ZR-1’s 4.3 s with care: it comes from an internal preproduction book GM marked confidential, and it’s quicker than any magazine timed a ZR-1. The same book times a preproduction manual LT1, rated at 320 lb-ft rather than the production 330, at 4.77 s. The 1996 chart doesn’t say where its “1995 performance data” came from, and GM’s 1993 and 1995 dealer books credit their extra times to periodicals, so those are magazine numbers. And the famous 150 mph for a 1985 is Car and Driver’s, which GM reprinted in its 1985 kit (page 6).

C4 road tests, 1983–1996

Sources: Car and Driver’s own archive pages for its 1984, 1986, 1988 (May), 1989, February 1990, April 1990 and 1993 ZR-1 tests; the Road & Track 1985 test as GM bound it into its 1985 kit (page 54); Motor Trend’s 1993 test in GM’s 1993 kit (page 170); the rest through Corvette Action Center’s tables, which give the issues.

In Car and Driver’s tests, top speed ran from 138 mph (1984) to 179 mph (1993 ZR-1). The base car went from 6.7 seconds to 60 in 1984 to 5.0 for a 1992 LT1, and a 1996 Grand Sport ran 5.1. The magazine’s April 1990 ZR-1 (opens in new tab) hit 60 in 4.6 seconds and 176 mph flat out, in a car any Chevrolet dealer could order; the ZR-1 guide has two more of its ZR-1 tests. No period test of a 1987 base car, a 1991, a 1994 or a 1995 turned up, and this page doesn’t borrow numbers across years.

The C4 bolt pattern (lug pattern) is 5 x 4.75 in (120.7 mm): five studs on that circle, every year, base car to ZR-1. GM’s forms from both ends of the run show it, with five M12 x 1.5 hex nuts per wheel, one of them a locking anti-theft nut (1984 kit, page 36; 1995 kit, page 143). The 1993–1996 owner’s manuals give the wheel nut torque as 100 lb-ft (140 N·m) (1994 owner’s manual, page 226); no GM figure for 1984–1992 cars turned up.

Sources: GM Heritage Center kits, 1984, page 36; 1986, page 36; 1987, page 54; 1988, page 54; 1989, page 154; 1990, page 82; 1992, page 20; 1993, page 4; 1995, page 143; 1996, page 27. Every tire GM lists is a Goodyear Eagle.

Z51, Z52 and Z07 are GM’s handling packages; through 1994, the Z07 also brought the heavy-duty brakes. The 1996 Grand Sport convertible kept the standard sizes. The buyer’s guide covers the 1988 recall of 17-inch wheels missing a weld.

Wheel offsets. 32 mm for the 1984–1986 16 x 8.5 in wheel, 38 mm for the Z51’s 16 x 9.5 in rear, 50 mm for the 1988 16-inch wheel, 56 mm for the 17-inch wheels from 1988 to 1995 and 36 mm for the 1995 ZR-1’s 17 x 11 in rear, by GM’s forms. None of the GM documents read for this page gives a center bore.

Air pressure: read the door. For everyday driving, the 1993–1996 owner’s manuals hand the job to the Tire-Loading Information label on the rear edge of the driver’s door (1996 owner’s manual, page 279). Their one number is 35 psi (240 kPa) for competitive driving or speeds over 150 mph, reduced afterward (1994 owner’s manual, page 207). GM’s specification forms print 35 psi for a coupe and 30 to 33 psi for a convertible (30 psi in 1995, 33 psi in GM’s 1992 service manual). The compact spare takes 60 psi.

Run-flats and the spare. Goodyear’s Extended Mobility run-flats were optional from 1994, with a warning that lights below 25 psi (1995 owner’s manual, page 119); GM rated them for up to 200 miles at up to 55 mph with no air. The compact spare on GM’s forms: a T155/70D17 on a 17 x 4 in wheel under the fuel tank in 1995, a P155/80D16 on a 16 x 4 in steel wheel in 1984.

Brake rotors. Vented discs at all four corners every year: 11.5 in for 1984–1987; 12 in from 1988, with 13 in fronts on the heavy-duty packages and the ZR-1; and from 1995, the heavy-duty brakes standard, 13 x 1.1 in front and 12 in rear (1995 kit, page 30). ABS became standard for 1986. Standard big brakes are one reason the buyer’s guide picks a 1995 or 1996.

The C4 had two kinds of dash. The all-electronic one, liquid-crystal displays and no needles at all, ran 1984–1989. For 1990 GM fitted a new panel with a digital speedometer and analog gauges, and kept that layout to the end:

Sources: GM Heritage Center kits, 1984, page 4; 1985, page 6; 1986, page 18; 1990, page 4; 1991, page 8 (the order guide’s “Analog and Digital Display”); 1992, pages 3 and 17; 1994, pages 12 and 36 (the ZR-1’s tachometer); 1995, page 78; 1996, pages 23 and 30.

The 1984–1989 cluster is what people mean by “the C4 digital dash,” and age has caught up with plenty of them: the buyer’s guide covers why they dim or wash out, and what owners pay for a rebuild.

An LT1 or LT4 takes 4.5 qt of oil with a filter change, by all four 1993–1996 owner’s manuals; GM gives an L98 5.0 qt and a ZR-1’s LT5 8.6 qt. GM’s 1992 service manual gave the LT1 5.0 qt, and its 1995 spec chart says 4.0, the manuals’ figure without a filter. Fill to the manual’s number, then check the dipstick.

Sources: GM’s service-manual pages in the 1985 kit (page 14) and 1992 kit (page 46); 1987 kit, page 34; 1990 kit, page 52; owner’s manuals, 1993 (page 312), 1994 (page 227), 1995 (page 313) and 1996 (pages 234, 243 and 307).

Coolant. No GM document explains the 17.8 qt in the 1993–1995 manuals, and GM’s other LT1 figures sit near 14.5, so treat coolant figures as approximate. GM’s LT5 figures disagree too: 14.7 qt in the manuals, 16.7 qt in the 1990 kit.

Oil and fuel notes. The ZR-1’s 8.6 qt is the manuals’ figure; GM’s 1995 chart says 9.0. That chart also puts the LT1 on 87 octane, but the owner’s manual is the book that came with the car: premium for best performance, as the table has it. GM’s oil filter numbers (OEM) are PF51 for the 1994 LT1, PF52 for 1996 and PF970C for the LT5 (1994 owner’s manual, page 226; 1996, page 306).

Headlamp and fog lamp bulbs. The 1993–1996 owner’s manuals list the headlamp as an HP6054 and the fog lamp as an 896 (OEM numbers, 1996 owner’s manual, page 304). No GM bulb list for 1984–1992 turned up. A headlight motor that keeps running after the lamp is up or down is a worn-bushing problem, not a bulb one: the buyer’s guide covers it.

Other fluids. DOT-3 brake fluid, DEXRON-IIE automatic transmission fluid (1993) and hydraulic clutch fluid GM 12345347 (OEM) (1993 owner’s manual, page 318). Which battery a C4 takes, and where it hides, is in the Corvette battery guide.

A C4 rides on a 96.2 in wheelbase every year and is 176.5 in long through 1990, about 178.5 in after. The body grew 2.1 in for 1991, by this site’s arithmetic, and GM’s papers from 1992 give new width, height and track figures.

Sources: GM Heritage Center kits, 1984, page 43; 1987, page 34; 1990, page 51; 1991, pages 8 and 47; 1992, page 20; 1994, page 33; 1995, page 61; owner’s manuals, 1994 (page 228) and 1996 (page 308).

Two small disagreements: the 1995 and 1996 owner’s manuals give the convertible the ZR-1’s 73.1 in width (every kit says 70.7 in; the 1995 guide calls it a print error), and the 1996 kit gives it a 60.6 in rear track against the manual’s 59.1. For a base car, go by 70.7 in and 59.1 in. GM’s coupe luggage figure drops from 17.9 to 12.6 cubic feet for 1992, and neither document says why. The turning circle is about 40 ft in every year’s figures.

By the EPA’s current figures, a C4 is rated 15 mpg city (13 for a 1984) and 20 to 24 highway. Fueleconomy.gov re-rates old cars under the method the EPA adopted for 2008, so these run below what GM printed when the cars were new. For 1990–1995 it lists two manual records a year without saying which is the ZR-1.

Source: fueleconomy.gov, every 1984–1996 Corvette record (record numbers in Sources), pulled October 30, 2026.

From 1986 on, every record is 15 city and 22 to 24 highway, whatever the engine; the 1996 six-speed (opens in new tab) is rated 15 / 24 / 18. GM’s old-method figures were higher: 16 city and 24 highway for a 1991 (16/25 for the ZR-1), and 17/24 automatic, 17/27 manual and 17/25 ZR-1 on its 1994 papers, which the 1995 chart repeats (1991 kit, page 16; 1995 kit, page 16).

Bowling Green built 358,180 C4s in 13 model years, by this site’s sum of the yearly figures, 6,939 of them ZR-1s. There was no 1983 model. Each year links to its own guide, home to its options, colors and changes.

Sources: production from GM’s kits for 1984–1987, 1989, 1990 and 1993 (1984, page 4; 1990, page 4), GM’s 1992 kit for 1991 (page 101) and Corvette Action Center’s production pages (opens in new tab) for 1988, 1992 and 1994–1996; prices from each year’s kit order guide, as each year’s guide gives them.

Inside those totals: 1,000 Grand Sports in 1996 (810 coupes and 190 convertibles), 5,412 Collector Editions the same year and 6,749 40th Anniversary cars in 1993. What those special editions are worth now is in the C4 buyer’s guide.

On a car this old, the service history counts for more than any figure here. What goes wrong and what a C4 sells for in 2026 are in the C4 buyer’s guide; the four-cam car has its own ZR-1 guide, and the generation that followed starts with the C5 (1997–2004).