The Chevrolet Corvette Coupe (C4) facelift of 1990, specifically the 5.7 V8 (281 hp) automatic variant, represents a significant evolution of the iconic American sports car. Produced from 1991 to 1996, this iteration of the C4 aimed to refine the model’s aesthetics and improve performance while maintaining its position as an accessible, high-performance grand tourer. It sat within the fourth generation Corvette (C4), which spanned from 1984 to 1996, and was a key part of Chevrolet’s effort to modernize the Corvette for a new era. The facelift brought subtle but noticeable changes to the exterior, and the 5.7L engine offered a substantial power upgrade over earlier C4 models.
Technical Specifications
| Brand | Chevrolet |
| Model | Corvette |
| Generation | Corvette Coupe (C4, facelift 1990) |
| Type (Engine) | 5.7 V8 (281 Hp) Automatic |
| Start of production | 1991 |
| End of production | 1996 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Targa |
| Seats | 2 |
| Doors | 2 |
| Fuel consumption (urban) | 16.7 l/100 km (14.1 US mpg) |
| Fuel consumption (extra urban) | 8-9.4 l/100 km (29.4 – 25 US mpg) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.3 sec |
| Acceleration 0 – 62 mph | 5.3 sec |
| Acceleration 0 – 60 mph | 5 sec |
| Maximum speed | 254 km/h (157.83 mph) |
| Weight-to-power ratio | 5.7 kg/Hp |
| Weight-to-torque ratio | 3.6 kg/Nm |
| Power | 281 Hp @ 5200 rpm |
| Torque | 437 Nm @ 2400 rpm (322.31 lb.-ft. @ 2400 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | LT1 |
| Engine displacement | 5733 cm3 (349.85 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 101.6 mm (4 in.) |
| Piston Stroke | 88.4 mm (3.48 in.) |
| Compression ratio | 10.5:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | OHV |
| Engine oil capacity | 4.3 l (4.54 US qt | 3.78 UK qt) |
| Coolant capacity | 16.9 l (17.86 US qt | 14.87 UK qt) |
| Kerb Weight | 1595 kg (3516.37 lbs.) |
| Trunk (boot) space | 357 l (12.61 cu. ft.) |
| Fuel tank capacity | 76 l (20.08 US gal | 16.72 UK gal) |
| Length | 4535 mm (178.54 in.) |
| Width | 1796 mm (70.71 in.) |
| Height | 1177 mm (46.34 in.) |
| Wheelbase | 2444 mm (96.22 in.) |
| Front track | 1466 mm (57.72 in.) |
| Rear track | 1500 mm (59.06 in.) |
| Drivetrain | Rear wheel drive |
| Number of gears | 4 |
| Gearbox type | Automatic transmission |
| Front suspension | Double wishbone, Transverse stabilizer, Leaf spring |
| Rear suspension | Independent multi-link suspension, Transverse stabilizer, Leaf spring |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 255/45 ZR17 |
| Wheel rims size | 8.5J x 17 |
Powertrain & Engine Architecture
The heart of this Corvette variant is the 5.7-liter (349.85 cubic inch) LT1 small-block V8 engine. Introduced in 1992, the LT1 represented a significant departure from the previous L98 engine. It featured reverse-flow cooling (where coolant flowed through the cylinder heads before the block), which improved cylinder head temperature control and allowed for a higher compression ratio of 10.5:1. The engine utilized sequential multi-port fuel injection, a system that precisely meters fuel into each cylinder for optimal combustion. The overhead valve (OHV) valvetrain, while traditional, was optimized for performance. The 4L60 automatic transmission, a four-speed unit, was standard. This transmission was known for its durability and relatively smooth shifts, though it wasn’t as performance-oriented as the available six-speed manual.
Driving Characteristics
The 5.7L automatic Corvette offered a compelling blend of performance and usability. While not as brutally quick as the manual transmission versions, the automatic provided a more relaxed driving experience, particularly in city traffic. The 281 horsepower and 322 lb-ft of torque were readily available, providing strong acceleration. The 0-60 mph time of around 5 seconds was respectable for the early 1990s. The automatic transmission’s gear ratios were tuned for a balance between acceleration and fuel economy. Compared to the earlier, less powerful C4s, this variant felt significantly more responsive and capable. However, enthusiasts often preferred the manual transmission for its greater driver involvement and slightly quicker acceleration.
Equipment & Trim Levels
The 1991-1996 Corvette Coupe with the 5.7L automatic typically came well-equipped. Standard features included leather seats, air conditioning, power windows and locks, and a Delco Bose sound system. The interior featured a driver-focused cockpit with analog gauges. Optional extras included a removable roof panel (making it a Targa top), upgraded sound systems, and various cosmetic enhancements. The interior trim was generally consistent across the 5.7L models, with options for different leather colors. This trim level was considered mid-range within the C4 lineup, offering a good balance of features and performance without the premium price tag of the ZR-1.
Chassis & Braking
The C4 Corvette utilized a lightweight aluminum frame, contributing to its relatively low curb weight of around 3516 lbs. The suspension consisted of independent front and rear suspension systems, employing transverse stabilizers and leaf springs. The front suspension used a double wishbone design, while the rear featured a multi-link setup. Both front and rear brakes were ventilated discs, providing ample stopping power. Anti-lock brakes (ABS) were standard, enhancing safety. The steering was a rack-and-pinion system with hydraulic power assist, offering precise and responsive handling.
Market Reception & Comparison
The 1991-1996 Corvette with the 5.7L automatic was generally well-received by automotive critics. It was praised for its improved performance, refined handling, and comfortable ride. Fuel economy was reasonable for a V8 sports car, averaging around 14-15 mpg in the city and 25-29 mpg on the highway. Compared to the earlier L98-powered Corvettes, the LT1 offered a noticeable increase in power and responsiveness. The automatic transmission was seen as a good choice for drivers who prioritized comfort and convenience over outright performance. However, some critics noted that the automatic transmission didn’t fully exploit the engine’s potential.
Legacy
The LT1-powered C4 Corvette has become a popular choice among enthusiasts and collectors. The 5.7L engine is known for its reliability and relatively simple maintenance requirements. While not as collectible as the high-performance ZR-1, the 5.7L automatic variant offers a compelling combination of performance, comfort, and affordability. Today, well-maintained examples can be found on the used car market at reasonable prices, making them an accessible entry point into Corvette ownership. The LT1 engine’s robust design and readily available parts ensure that these cars will continue to be enjoyed for years to come.
