Corvette 305 327 1968 Workshop Repair Service Manual

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🏷️ Basic Information Identification Make: Chevrolet Model: Corvette Year: 1968 Engine Codes Covered: L68 (427ci/390hp Tri-Power), L71 (427ci/400hp Tri-Power), L88 (427ci/430hp Special), L36 (427ci/390hp), L30 (327ci/300hp), L79 (327ci/350hp), L46 (327ci/350hp)...

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Taper: Car

Distributeur:

UGS: 453576

Mots clés: 1968 305 327 Car Cars Chevrolet Corvette Misc

Variantes de produits

Description

🏷️ Basic Information

Identification

Make:

Chevrolet

Model:

Corvette

Year:

Engine Codes Covered:

L68 (427ci/390hp Tri-Power), L71 (427ci/400hp Tri-Power), L88 (427ci/430hp Special), L36 (427ci/390hp), L30 (327ci/300hp), L79 (327ci/350hp), L46 (327ci/350hp) - Note: Manual title incorrectly lists 305, likely a typo referring to 327.

Codes

Chassis Codes:

👋 Introduction

Market Position

Target Audience:

Restorers, classic car enthusiasts, mechanics specializing in vintage American automobiles, and Corvette owners seeking in-depth repair knowledge.

Value Proposition:

Provides comprehensive, factory-level repair and maintenance information essential for preserving and servicing the iconic 1968 Corvette.

Competitive Analysis

Comparison To Owner Manuals:

Significantly more detailed than an owner's manual, offering in-depth mechanical procedures, diagnostics, and specifications.

Comparison To Other Manuals:

A professional workshop manual, generally more exhaustive and authoritative than general Haynes or Chilton manuals for this era.

Key Features

Comprehensiveness:

Covers nearly every mechanical and electrical system of the 1968 Corvette.

Technical Accuracy:

Information derived from GM factory documentation ensures high accuracy for repairs and maintenance.

Visuals:

Includes detailed diagrams, illustrations, and troubleshooting flowcharts.

📋 Manual Details

Coverage Areas

Manual Type:

Workshop Repair Service Manual

Language:

English

Format:

PDF Download

Models Covered:

All 1968 Chevrolet Corvette Models (Coupe, Convertible)

Trim Levels Covered:

All Trim Levels

Transmission Types Covered:

Manual (Muncie 4-Speed, BorgWarner Super T-10) and Automatic (Powerglide, Turbo Hydra-Matic 400)

📖 Manual Coverage

Systems Covered

Engine Service:

Engine overhaul, tune-up, lubrication, cooling system, fuel system (carburetors, fuel injection systems for L88), ignition system, exhaust system, engine diagnostics and troubleshooting.

Transmission Service:

Manual and automatic transmission removal, installation, disassembly, assembly, adjustments, and troubleshooting.

Drivetrain Service:

Clutch, driveshaft, universal joints, rear axle assembly (differential, half-shafts, U-joints) service and repair.

Braking System Service:

Front disc brakes, rear drum brakes, hydraulic system, parking brake service, troubleshooting.

Suspension And Steering Service:

Front and rear suspension components (springs, shocks, control arms, ball joints, bushings), steering system (steering gear, linkages, power steering) service and alignment procedures.

Electrical System Service:

Wiring diagrams, battery, charging system (alternator), starting system, lighting system, instruments, gauges, horn, power windows, radio, and troubleshooting electrical faults.

Body And Chassis Service:

Frame, body panels, doors, windows, convertible top, weatherstripping, bumpers, interior trim, seats, and body repair procedures.

Procedures Included

Maintenance Procedures:

Oil changes, filter replacements, fluid level checks and top-offs, lubrication points, spark plug replacement, belt adjustments, tune-up procedures.

Repair Procedures:

Engine rebuilds, transmission overhaul, brake caliper replacement, suspension component replacement, starter motor and alternator repair, fuel pump replacement.

Troubleshooting Guides:

Systematic diagnostic procedures for common and uncommon problems, including engine performance issues, electrical faults, braking system malfunctions, and transmission shifting problems.

Adjustment Procedures:

Carburetor adjustments, ignition timing settings, brake adjustments, clutch pedal adjustment, steering gear adjustments.

Technical Depth

Diagnostic Capabilities:

Detailed diagnostic charts, symptom-based troubleshooting, specific component testing procedures, electrical system schematics.

Rebuild Instructions:

Comprehensive step-by-step instructions for complete disassembly, inspection, repair, and reassembly of major components like engines, transmissions, and differentials, including torque specifications and clearances.

Specifications Data:

Precise torque values for all fasteners, engine clearances, fluid capacities, electrical resistance values, alignment specifications, and critical measurement data.

📊 Manual Specifications

File Format

File Type:

PDF (Portable Document Format)

Searchability:

Text-searchable for quick information retrieval

Printability:

Printable for offline use and workshop reference

Image Quality:

High-resolution scans of original diagrams and photographs

Print Quality

Original Source:

Likely derived from original GM factory service manuals or professional aftermarket publications.

Binding Type

Binding For Physical Copy:

N/A (Digital PDF download)

Paper Type

Paper Type For Physical Copy:

N/A (Digital PDF download)

⚙️ Engine Specifications

Primary Engine

Base Engine Displacement:

327 cubic inches (5.4 Liters)

Optional Engines Displacement:

427 cubic inches (7.0 Liters)

Performance

327Ci Hp Range:

300 hp (L30) to 350 hp (L79, L46)

427Ci Hp Range:

390 hp (L36, L68) to 430 hp (L88)

427Ci Tri Power Availability:

Yes (L68, L71)

L88 Engine Type:

High-performance, racing-oriented, typically with aluminum heads and high compression.

Fuel System

Carburetion:

Single 4-barrel carburetor (e.g., Rochester Quadrajet, Holley) for 327s and base 427s. Tri-Power (three 2-barrel carburetors) for L68 and L71. Single 4-barrel (Holley) for L36 and L46. Specific racing carburetors for L88.

Fuel Type:

Premium Unleaded Gasoline (Octane rating requirements vary by engine, higher compression engines require higher octane).

Fuel Pump:

Mechanical fuel pump.

🔧 Transmission

Standard

Standard Transmission Type:

Muncie 4-speed manual transmission (e.g., M20, M21, M22 variants).

Optional

Optional Transmission Types:

3-speed Turbo Hydra-Matic 400 automatic; Powerglide 2-speed automatic (less common in performance models).

Features

Clutch System:

Single dry plate, hydraulically actuated clutch.

Rear Axle Ratio Options:

Various ratios available, typically ranging from 3.08:1 to 4.56:1 depending on engine and transmission. Positraction (limited-slip differential) was an option.

📐 Dimensions

Exterior

Wheelbase:

98 inches

Overall Length:

175.0 inches

Overall Width:

69.1 inches

Overall Height:

47.7 inches (Coupe)

Front Track:

55.1 inches

Rear Track:

56.5 inches

Weights

Curb Weight:

Approximately 3,000 - 3,400 lbs, varying by engine and options.

Gross Vehicle Weight Rating:

Not typically specified in detail for performance vehicles of this era, but generally around 4,000 lbs.

🛡️ Safety Features

Ratings

Crash Test Ratings:

N/A (Modern crash testing standards did not exist in 1968).

Active Features

Braking System:

Power-assisted front disc brakes, rear drum brakes. Optional power-assisted rear disc brakes were available on some L88 models.

Steering System:

Recirculating ball steering gear. Optional power steering.

Passive Features

Seat Belts:

Standard lap belts; shoulder belts were an optional feature.

Windshield:

Laminated safety glass.

Collapsible Steering Column:

Introduced in the C3 generation, offering improved occupant safety in frontal impacts.

💡 Technology Features

Infotainment

Radio Options:

AM, AM/FM, AM/FM with stereo 8-track tape player were available options.

Speaker Configuration:

Typically two dash-mounted speakers; optional rear speakers available.

Driver Assistance

Cruise Control:

Optional cruise control system available.

Air Conditioning:

Optional air conditioning system available.

Connectivity

Power Accessories:

Optional power windows, power door locks (less common on early C3s).

🔧 Maintenance

Service Intervals

Oil Change Interval:

Typically every 3,000 miles or 6 months. For high-performance or spirited driving, more frequent changes are recommended.

Tune Up Interval:

Recommended every 12,000 - 24,000 miles, depending on ignition system condition (points vs. electronic) and driving habits.

Transmission Fluid Change:

Manual: Inspect periodically, change as needed. Automatic: Typically every 24,000 - 48,000 miles.

Coolant Flush:

Every 24,000 miles or 2 years.

Fluid Specifications

Engine Oil Viscosity:

SAE 10W-30 or 10W-40 for general use. SAE 20W-50 for high-performance or hot weather. Consult specific engine manual for exact recommendations.

Engine Oil Capacity:

Approximately 5 quarts (4.7 liters) with filter for 327 engines; 6 quarts (5.7 liters) with filter for 427 engines.

Transmission Fluid Type Manual:

GL-4 gear oil (e.g., SAE 80W-90 or SAE 75W-90).

Transmission Fluid Type Automatic:

Dexron III/Mercon (or equivalent). Originally Dexron II.

Coolant Type:

Ethylene Glycol based antifreeze mixed with water (typically 50/50 ratio).

Brake Fluid Type:

DOT 3 or DOT 4 (refer to manual for specific DOT rating).

Known Issues

Carburetor Issues:

Vibration leading to carburetor adjustments, vacuum leaks, flooding (especially with Tri-Power).

Electrical System Issues:

Aging wiring harnesses, corrosion in connectors, intermittent electrical faults, headlight vacuum actuators (if equipped).

Suspension And Chassis Wear:

Worn ball joints, control arm bushings, and tie rod ends due to age and mileage. Frame corrosion in certain climates.

Body And Trim Deterioration:

Cracking fiberglass, deteriorating weatherstripping, fading paint, interior component wear.

L88 Engine Specifics:

High-strung nature requires careful maintenance; prone to overheating if cooling system is not optimal. Often modified from original specifications.

📚 Vehicle History

Brand Heritage

Chevrolet Legacy:

Chevrolet, a division of General Motors, has a long history of producing performance-oriented vehicles and sports cars, with the Corvette being its flagship.

Model Evolution

C3 Introduction:

The 1968 model year marked the introduction of the third-generation Corvette (C3), codenamed 'Stingray', featuring an iconic Mako Shark-inspired design.

Design Influences:

The C3 design was heavily influenced by the Mako Shark II concept car developed by Larry Shinoda.

Engine Options Evolution:

The 1968 model offered both the smaller 327 V8 and the potent Big-Block 427 V8, including the highly sought-after L88 variant designed for racing.

Production

Production Period:

1968-1982 (C3 generation)

Manufacturing Location:

St. Louis, Missouri, USA

1968 Production Volume:

Approximately 38,762 units (across all variants).

🏆 Awards & Recognition

Recognitions

Iconic Status:

The 1968 Corvette C3 is widely recognized as a design icon and a desirable classic American sports car.

Collectible Value:

Highly collectible, with values varying significantly based on engine, originality, condition, and documentation. L88 and high-performance 327 variants are particularly sought after.

Ratings

Performance Ratings:

Praised for its powerful engine options and sporty handling characteristics for its era, though often criticized for a somewhat stiff ride and interior noise.

Certifications

Historic Vehicle Status:

Many 1968 Corvettes are eligible for historic vehicle registration and associated benefits in various regions.