🏷️ Basic Information

Make:

Chevrolet

Model:

Corvette

Year:

1973

Engine Identifier:

396 Big Block V8

Chassis Code:

C3

Vin Digits:

1Z67J3S4XXXXX (Example format for a Coupe, J denotes 350 CI 4BBL. 396 engine would typically be designated differently depending on specific GM codes, but the manual covers specified engine variants.)

👋 Introduction

Positioning:

The 1973 Corvette represented the pinnacle of American sports car engineering for its era, blending performance, luxury, and iconic styling. This manual caters to owners and enthusiasts dedicated to maintaining and restoring these classic vehicles.

Competitors:

In its segment, the Corvette competed with high-performance European sports cars and other domestic muscle cars, but its unique blend of styling and performance set it apart. This manual provides the essential information to keep it performing at its best.

Manual Value:

Essential for any owner seeking to perform their own maintenance or understand complex repair procedures. Offers significant cost savings over professional shop labor.

📋 Manual Details

Coverage Scope:

All Models/Engines/Trim/Transmissions Types for the 1973 Corvette

Estimated Page Count:

Estimated 800-1200 pages (typical for comprehensive workshop manuals of this era)

Type:

Workshop Repair Service Manual

Language:

English

Format:

PDF Download

📖 Manual Coverage

Powertrain:

Engine (396 Big Block V8), cooling system, fuel system (carburetion), exhaust system, transmission (manual & automatic options).

Chassis:

Frame, suspension (front & rear independent), steering system, brakes (disc & drum variants), wheels, tires.

Electrical:

Wiring diagrams, ignition system, charging system, starting system, lighting, instrumentation, accessories, radio, power windows/locks (if equipped).

Body:

Exterior body panels, interior trim, weatherstripping, glass, doors, hood, T-tops, seats, carpeting.

Maintenance:

Scheduled maintenance, fluid changes, lubrication, filter replacements, tune-ups.

Repair:

Engine overhaul, transmission repair, brake system overhaul, suspension component replacement, electrical system diagnostics and repair, body panel alignment and repair.

Troubleshooting:

Diagnostic procedures for common and uncommon issues, fault finding charts, symptom-based diagnostics.

Special Tools:

Identification and use of specialized tools required for specific repairs.

Depth:

Comprehensive, covering everything from basic adjustments to complete engine and transmission rebuilds. Includes detailed torque specifications, clearances, and assembly procedures.

📊 Manual Specifications

Digital Quality:

High-resolution scan, likely searchable text (depending on original source quality).

Reproducibility:

Suitable for printing individual sections or the entire manual, with clear diagrams and text.

Original Binding:

Typically wire-bound or stitched for workshop use.

Original Paper:

Heavy-duty, possibly coated paper to withstand shop environment.

⚙️ Engine Specifications

Engine Code Variant:

L48 (350ci/250hp - standard, manual covers 396 option)

Engine Displacement 396:

396 cubic inches (6.5 Liters)

Engine Configuration 396:

90-degree V8

Horsepower 396:

Estimated 310-325 HP (GM officially rated higher for earlier years, but 1973 saw continued horsepower reduction due to emissions controls. Actual output varied.)

Torque 396:

Estimated 400-420 lb-ft

Carburetor Type:

Rochester Quadrajet (4-barrel)

Fuel Type:

Unleaded gasoline (required from 1971 onwards)

Ignition Type:

Breaker-point ignition (standard), optional early electronic ignition may be covered.

Radiator Capacity:

Approx. 20-22 Quarts

Coolant Type:

Ethylene Glycol based antifreeze (50/50 mix with distilled water)

🔧 Transmission

Standard Transmission:

4-Speed Manual (Muncie M21/M22 variants often found)

Optional Transmission:

3-Speed Turbo-Hydramatic Automatic (TH400)

Manual Gear Ratios:

Manuals varied; typically close-ratio. Example M21: 2.20, 1.66, 1.31, 1.00

Automatic Transmission Details:

TH400 is a robust heavy-duty automatic known for its durability.

Manual Transmission Fluid:

GL-4 Gear Oil (e.g., 80W-90 or 75W-90)

Automatic Transmission Fluid:

Dexron III (or equivalent, check manual for exact spec)

📐 Dimensions

Length:

177.5 inches

Width:

70.8 inches

Height:

46.2 inches

Wheelbase:

98.0 inches

Curb Weight:

Approx. 3,300 - 3,500 lbs (depending on engine and options)

Gross Vehicle Weight Rating:

Approx. 4,300 lbs

Cargo Volume:

Minimal, primarily for luggage behind the seats and optional rear compartment.

🛡️ Safety Features

Crash Test Data:

Not subjected to modern NHTSA crash testing protocols. Safety features reflect 1970s standards.

Braking System:

Power-assisted 4-wheel disc brakes (standard on all 1973 Corvettes).

Steering System:

Power steering (standard on most models, check specific options)

Seatbelts:

Three-point retractable front seatbelts.

Body Construction:

Fiberglass reinforced plastic (FRP) body over a steel ladder frame chassis.

Windshield:

Laminated safety glass.

💡 Technology Features

Audio System:

AM/FM radio, optional AM/FM stereo with 8-track tape player. Speaker placement varies (dash, doors).

ABS:

Anti-lock Braking System (ABS) was not available on this model.

Cruise Control:

Optional cruise control system available.

Original Connectivity:

No digital connectivity. Focus is on mechanical and electrical systems.

🔧 Maintenance

Oil Change Interval:

Every 3,000 miles or 6 months, whichever comes first (typical for the era; manual may provide specific recommendations based on oil type).

Tune Up Interval:

Typically every 12,000-24,000 miles, involving spark plugs, points, condenser, rotor, distributor cap, and fuel filter.

Transmission Fluid Change:

Every 24,000-36,000 miles or as recommended by manual. Fluid condition is key.

Engine Oil Capacity:

5 Quarts (with filter) for small blocks, 6 Quarts (with filter) for big blocks (e.g., 396).

Engine Oil Type:

API SF/CD rated oils, SAE 10W-30 or 10W-40 recommended. High zinc content (ZDDP) is beneficial for flat-tappet camshafts often found in these engines (consult manual for specific recommendations or use break-in oil).

Brake Fluid Type:

DOT 3 hydraulic brake fluid.

Carburetor Issues:

Rochester Quadrajet can be prone to fuel leaks, needle/seat wear, and accelerator pump diaphragm failure. Rebuilds are common.

Fiberglass Body:

Cracking, spider-webbing, and delamination of fiberglass can occur with age and stress. Body repair requires specialized knowledge.

Vacuum Leaks:

Numerous vacuum hoses and diaphragms can deteriorate, leading to rough idle and performance issues. Meticulous inspection and replacement are critical.

Weatherstripping:

Original rubber seals degrade over time, leading to water leaks into the cabin, particularly around T-tops and doors.

📚 Vehicle History

Chevrolet Heritage:

Chevrolet, founded in 1911, has a long history of producing accessible and performance-oriented vehicles, with the Corvette being its flagship sports car since 1953.

C3 Generation:

The C3 Corvette (1968-1982) underwent significant styling and mechanical changes. The 1973 model year marked the discontinuation of chrome bumpers at the front, replaced by a flexible urethane nose, and the removal of side-impact chrome guards.

Engine Options 1973:

While the 396 Big Block was a powerful option, the 350 small block V8 (in various states of tune, including L82) was more common in 1973 due to shifting market demands and emissions regulations.

Production Location:

St. Louis, Missouri, USA

Total 1973 Production:

30,464 units (includes all engine and body style configurations)

🏆 Awards & Recognition

Automotive Icon:

The C3 Corvette is widely recognized as an automotive icon and a significant part of American automotive history.

Classic Car Status:

Highly sought after by collectors and enthusiasts, often featured in classic car publications and events.

Gm Certification:

This manual is a direct reproduction or compilation of original General Motors factory service information.