🏷️ Basic Information Identification Make: Chevrolet Model: Corvette Year: 1981 Sub Model: 427 Codes Chassis Code: C3 Vin Prefix: 1G1 👋 Introduction Market Position Positioning: The definitive guide for maintaining and repairing the iconic 1981 Chevrolet Corvette 427, a highly collectible performance vehicle. Competitive Analysis 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. Key Features Features: Includes detailed wiring diagrams, component identification, diagnostic flowcharts, and torque specifications crucial for accurate repairs. 📋 Manual Details Coverage Areas All Models Engines Trims Transmissions: true Page Count Estimated Pages: 1500+ Manual Type Type: Workshop Repair Service Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered 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 Procedures Included 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 Technical Depth 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 📊 Manual Specifications File Format PDF Quality: High resolution, searchable text, printable pages Print Quality Print Recommendation: Recommended for printing on standard paper for workshop use. Binding Type Binding Type: N/A (Digital PDF) Paper Type Paper Type: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine 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) Performance Horsepower: 200 hp @ 3600 rpm (L82, net) Torque: 270 lb-ft @ 3200 rpm (L82, net) Fuel System Fuel Delivery: Rochester Quadra-Jet 4-barrel carburetor Fuel Type: Unleaded gasoline, 87 octane (minimum) recommended for L82 Engine Management Ignition System: Electronic spark control (ESC), high energy ignition (HEI) Cooling System Coolant Capacity: Approx. 17 quarts (16.1 liters) with heavy-duty cooling Lubrication System Oil Capacity: 5 quarts (4.7 liters) with filter 🔧 Transmission Standard Transmission Type: Automatic Transmission THM350 Optional Transmission Type: 4-Speed Manual Transmission Transmission Type Automatic: Automatic Transmission THM400 (Heavy Duty Option) Features 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 📐 Dimensions Exterior Length: 177.5 inches (4509 mm) Width: 71.2 inches (1808 mm) Height: 47.9 inches (1217 mm) Wheelbase: 98.0 inches (2489 mm) Weights Curb Weight: Approx. 3300-3500 lbs (1497-1588 kg) depending on options 🛡️ Safety Features Ratings Federal Safety Standards: Compliant with all applicable federal motor vehicle safety standards for 1981. Active Features Brakes: Four-wheel power disc brakes Passive Features Seatbelts: Three-point shoulder belts and lap belts Steering Column: Collapsible steering column 💡 Technology Features Infotainment Audio System: AM/FM stereo with cassette player (optional). Driver Assistance Cruise Control: Standard on most models. Connectivity Early Tech: Focus on mechanical and electrical systems rather than electronic connectivity. 🔧 Maintenance Service Intervals 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. Fluid Specifications 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. Known Issues Common Issues: Carburetor tuning, vacuum leaks, aging rubber bushings, headlight vacuum actuator failure, interior wear, potential for rear main seal leaks. Filter Part Numbers Oil Filter: AC Delco PF2, Fram PH8A, Wix 51515 (example, verify with manual). Air Filter:...