Positioning:
The definitive guide for maintaining and repairing the iconic 1981 Chevrolet Corvette 427, a highly collectible performance vehicle.
Advantage:
Offers unparalleled detail compared to generic repair guides, providing factory-level information specific to the 1981 model year and its unique 427 V8 configuration.
Features:
Includes detailed wiring diagrams, component identification, diagnostic flowcharts, and torque specifications crucial for accurate repairs.
Engine:
Complete overhaul, tune-up, cooling, lubrication, fuel, exhaust, emissions control, diagnosis
Transmission:
Automatic (THM350, THM400) and Manual (4-speed) - overhaul, adjustment, fluid service
Drivetrain:
Driveshaft, U-joints, differential, rear axle assembly
Suspension:
Front (independent, A-arms, ball joints, bushings), Rear (independent, trailing arms, universal joints)
Steering:
Power steering system, steering column, linkage, diagnosis
Brakes:
Front disc, rear disc, power assist, parking brake, hydraulic system, troubleshooting
Electrical:
Battery, charging system, ignition, starting system, lighting, instruments, wiring diagrams, fuses, relays
HVAC:
Air conditioning system, heater core, blower motor, controls
Body And Frame:
Frame inspection, body panel repair, doors, windows, interior trim, convertible top mechanism
Chassis:
Lubrication points, alignment specifications
Maintenance:
Oil change, filter replacement, lubrication, coolant flush, spark plug replacement, belt adjustment
Troubleshooting:
Systematic diagnostic procedures for common and uncommon faults
Repair:
Step-by-step instructions for component removal, disassembly, repair, and reassembly
Diagnostics:
Fault finding using visual inspection, measurement, and specified test procedures
Adjustments:
Carburetor, ignition timing, brakes, clutch, idle speed
Replacements:
All major components including engine, transmission, suspension parts, body panels
Depth:
Comprehensive; covers everything from basic maintenance to complete engine and transmission rebuilds, including electrical system diagnostics.
Target Audience:
Professional mechanics and experienced DIY enthusiasts
Engine Type:
V8, Small Block Chevrolet
Engine Displacement:
5.7L (350 cubic inches)
Engine Code:
L82 (Often associated with performance trims like the '427' designation, although 1981 did not officially use the '427' badge, it typically refers to high-performance L82 equipped models).
Bore X Stroke:
4.00 in x 3.48 in (101.6 mm x 88.4 mm)
Compression Ratio:
8.2:1 (L82)
Horsepower:
200 hp @ 3600 rpm (L82, net)
Torque:
270 lb-ft @ 3200 rpm (L82, net)
Fuel Delivery:
Rochester Quadra-Jet 4-barrel carburetor
Fuel Type:
Unleaded gasoline, 87 octane (minimum) recommended for L82
Ignition System:
Electronic spark control (ESC), high energy ignition (HEI)
Coolant Capacity:
Approx. 17 quarts (16.1 liters) with heavy-duty cooling
Oil Capacity:
5 quarts (4.7 liters) with filter
Transmission Type:
Automatic Transmission THM350
Transmission Type:
4-Speed Manual Transmission
Transmission Type Automatic:
Automatic Transmission THM400 (Heavy Duty Option)
Fluid Type Automatic:
Dexron III Automatic Transmission Fluid (ATF) - refer to manual for exact specification
Fluid Type Manual:
GL-4 or GL-5 Gear Oil (SAE 75W-90 or 80W-90) - refer to manual for exact specification
Oil Change Interval:
Every 3,000 miles or 6 months, whichever comes first (refer to manual for specific recommendation based on driving conditions).
Tune Up Interval:
Inspect spark plugs, distributor cap, rotor, and ignition wires every 12,000 miles or 12 months.
Transmission Fluid Change:
Every 24,000 miles or 24 months for automatic, refer to manual for manual transmission.
Engine Oil Type:
API Service SF or SG, SAE 10W-30 or 10W-40 recommended (refer to manual for specific viscosity based on temperature).
Coolant Type:
Ethylene Glycol based antifreeze, 50/50 mix with distilled water.
Brake Fluid Type:
DOT 3 or DOT 4.
Common Issues:
Carburetor tuning, vacuum leaks, aging rubber bushings, headlight vacuum actuator failure, interior wear, potential for rear main seal leaks.
Oil Filter:
AC Delco PF2, Fram PH8A, Wix 51515 (example, verify with manual).
Air Filter:
AC Delco A1119C (example, verify with manual).
Heritage:
Chevrolet's Corvette represents American sports car dominance, known for performance and style since its 1953 debut.
Evolution 1981:
The 1981 model marked the final year of the C3 generation's long run, featuring updated emission controls and refined styling. The '427' designation in this context typically refers to models equipped with the potent L82 engine, reminiscent of the legendary big-block Corvettes.
Production Years:
C3 Generation: 1968-1982
Production Location:
Bowling Green, Kentucky, USA
