Engine Designation:
L48 350ci (5.7L) V8 / L81 350ci (5.7L) V8
Trim Levels:
Coupe, Convertible (limited production)
Vibration Damper Code:
Refer to manual for specific codes
Engine Code:
Varies based on L48/L81 designation (refer to manual)
Transmission Code:
Varies based on M40/M20/M31 designation (refer to manual)
Positioning:
The 1981 Corvette represented a transitionary period for the C3 generation, focusing on drivability and refinement while maintaining its sports car identity. This manual serves enthusiasts and mechanics working on a classic American icon.
Competitors:
Competed against European sports cars like Porsche 924/944, Jaguar XJ-S, and other American performance cars of the era.
Features:
The 1981 model year saw the introduction of the L81 engine, offering improved emissions control and efficiency. The focus shifted slightly towards a more refined touring experience while retaining performance credentials.
Powertrain:
Engine mechanical (L48/L81 350ci V8), fuel system, ignition system, exhaust system, transmission (automatic M40, manual M20/M31), drive axle, cooling system, lubrication system, emissions control systems.
Chassis:
Suspension (front and rear independent), steering system, brake system (front disc, rear disc), wheels and tires.
Electrical:
Wiring diagrams, lighting, instrument cluster, power accessories, charging system, starting system, engine control module (ECM) diagnostics.
Body:
Exterior body panels, interior trim, doors, windows, locks, weatherstripping, convertible top mechanism (if applicable).
Maintenance:
Routine servicing, oil changes, filter replacements, tune-ups, fluid checks and changes, lubrication.
Repair:
Engine overhaul, transmission rebuild, brake service, suspension component replacement, electrical system diagnosis and repair, body panel repair.
Troubleshooting:
Diagnostic procedures for common drivability issues, electrical faults, mechanical failures, and performance problems.
Diagnostics:
Step-by-step diagnostic flowcharts and specifications for identifying and resolving problems.
Depth:
Comprehensive coverage from basic maintenance and adjustments to complete engine and transmission rebuilds, including detailed electrical diagnostics and component-level repair.
Engine 1:
L48 350ci (5.7L) V8. Bore x Stroke: 4.00 in. x 3.48 in. Compression Ratio: 8.2:1. Horsepower: 190 hp @ 4000 rpm. Torque: 285 lb-ft @ 2400 rpm.
Engine 2:
L81 350ci (5.7L) V8. Bore x Stroke: 4.00 in. x 3.48 in. Compression Ratio: 8.2:1. Horsepower: 190 hp @ 4000 rpm. Torque: 285 lb-ft @ 2400 rpm. (Features improved emissions control and California-specific tuning).
0-60 Mph:
Approximately 7-8 seconds (depending on transmission and driver).
Top Speed:
Approximately 130-135 mph.
System:
Rochester Quadra-Jet 4-barrel carburetor. Mechanical fuel pump.
Fuel Type:
Unleaded gasoline, 91 octane (87 octane acceptable for L81).
Crash Test Results:
NHTSA ratings from this era are not directly comparable to modern standards. Refer to historical automotive safety databases for specific frontal/side impact data.
Active Features:
Four-wheel power disc brakes, power steering.
Passive Features:
Three-point seat belts, energy-absorbing steering column, interior padding.
Audio System:
AM/FM stereo radio with cassette player (optional). Power antenna.
Driver Assistance:
Power steering, power brakes.
Connectivity:
No modern connectivity features (Bluetooth, USB, etc.) are present; aftermarket upgrades are common.
Oil Change:
Every 3,000 miles or 6 months (refer to manual for specific oil type and viscosity).
Tune Up:
Inspect spark plugs, ignition wires, and distributor cap/rotor every 15,000 miles. Replace as needed.
Transmission Fluid Change:
Every 30,000 miles or 24 months for automatic transmission. Manual transmission fluid change every 60,000 miles.
Engine Oil:
API Service SG or higher. Viscosity: SAE 10W-30 (preferred), SAE 5W-30 for extreme cold, SAE 30 for high temps. Capacity: 5 quarts with filter (refer to manual for precise capacity).
Transmission Fluid Automatic:
Dexron III/Mercon ATF. Capacity: 3 quarts (dry fill).
Transmission Fluid Manual:
GL-4 80W-90 gear oil. Capacity: 2 quarts.
Coolant:
50/50 mixture of ethylene glycol antifreeze and distilled water. Capacity: 19 quarts.
Brake Fluid:
DOT 3 or DOT 4 brake fluid.
Common Problems:
Carburetor tuning and adjustment, vacuum leaks, aging rubber and plastic components, electrical connector corrosion, potential for rear main seal leaks, fiberglass body stress cracks.
Emissions Controls:
Specific to 1981, the L81 engine and emissions systems require careful maintenance. Vacuum hose routing and EGR valve function are critical.
Heritage:
Chevrolet's Corvette lineage began in 1953, establishing itself as America's premier sports car with a focus on performance and design.
C3 Generation:
The 1981 model is part of the third-generation (C3) Corvette, which ran from 1968 to 1982. This generation is characterized by its iconic 'Mako Shark' styling and extensive design refinements over its lifespan.
Production Years:
1968-1982 (C3 generation).
Manufacturing Location:
Bowling Green, Kentucky, USA.
Production Volume 1981:
Approximately 40,606 units produced for the 1981 model year.
