1974 CORVETTE

General Specifications

Chasis:

Wheelbase: 98"

Overall Length: 185.5"

Tire Size: G70 x 15 inches

Body Data:

Sting Ray, 8 Cylinder:

2 Door Fastback Coupe, 2 Passenger, Series #Z; Body #37

Base Price: $6,372; Shipping Weight: 3,532 Pounds;

Production Total: 32,029

2 Door Convertible, 2 Passenger, Series #Z; Body #67

Base Price: $6,156; Shipping Weight: 3,532 Pounds;

Production Total: 5,472

8 Cylinder Engine Specifications:

195 HP Engine:

Engine Type: V-Type 8 Cylinder, Overhead Valve

Bore & Stroke: 4.00" x 3.48"

Engine Displacement: 350 Cu. In.

Compression Ratio: 8.5 to 1;

Taxable Horsepower: 51.23

Horsepower: 195 @ 4,400 RPM

Maximum Torque: 275 Ft Lbs @ 2,800 RPM

Normal Oil Pressure: 40 PSI

One, 4 Barrel Carburetor

250 HP Engine:

Engine Type: V-Type 8 Cylinder, Overhead Valve

Bore & Stroke: 4.00" x 3.48"

Engine Displacement: 350 Cu. In.

Compression Ratio: 9.0 to 1;

Taxable Horsepower: 51.23

Horsepower: 250 @ 5,200 RPM

Maximum Torque: 285 Ft Lbs @ 4,000 RPM

Normal Oil Pressure: 40 PSI

One, 4 Barrel Carburetor

270 HP Engine:

Engine Type: V-Type 8 Cylinder, Overhead Valve

Bore & Stroke: 4.251" x 4.00"

Engine Displacement: 454 Cu. In.

Compression Ratio: 8.5 to 1;

Taxable Horsepower: 57.80

Horsepower: 270 @ 4,400 RPM

Maximum Torque: 380 Ft Lbs @ 2,800 RPM

Normal Oil Pressure: 45 PSI

One, 4 Barrel Carburetor

Available Axle Ratios:

Not Available

1974 CORVETTE

Tune Up Specifications:

8 Cylinder 350 Cu. In. Engine, 195 HP:

Spark Plug: AC R44T

Spark Plug Gap .035"

Point Gap: .019"

Distributor Cam Angle: 29-31 Degrees

Firing Order: 1-8-4-3-6-5-7-2

Ignition Timing: 8 Degrees BTDC on Damper

Engine Idle Speed:

Standard Transmission: 900 RPM

Automatic Transmission: 600 RPM in Drive

8 Cylinder 350 Cu. In. Engine, 250 HP:

Spark Plug: AC R44T

Spark Plug Gap .035"

Firing Order: 1-8-4-3-6-5-7-2

Ignition Timing: 8 Degrees BTDC on Damper

Engine Idle Speed:

Standard Transmission: 900 RPM

Automatic Transmission: 700 RPM in Drive

8 Cylinder 454 Cu. In. Engine:

Spark Plug: AC R44T

Spark Plug Gap .035"

Point Gap: .019"

Dwell Angle: 29-31 Degrees

Firing Order: 1-8-4-3-6-5-7-2

Ignition Timing: 10 Degrees BTDC on Damper

Engine Idle Speed:

Standard Transmission: 900 RPM

Automatic Transmission: 600 RPM in Drive

Valve Specifications:

8 Cylinder Engine, 350 Cu. In., 195 H.P.:

Operating (Tappet) Clearance, Hot:

Intake: 1 Turn

Exhaust: 1 Turn

Valve Seat Angle:

Seat: 46 Degrees

Face 45 Degrees

Valve Spring Height Installed:

Intake: 1.70"

Exhaust: 1.61"

Valve Spring Pressure:

Intake: 200 Lbs. @ 1.25"

Exhaust: 189 Lbs @ 1.20"

Valve Stem Clearance:

Intake .001"-.0027"

Exhaust .0012"-.0029"

Valve Stem Diameter:

Intake: .3410"-.3417"

Exhaust: .3410"-.3417"

8 Cylinder Engine, 350 Cu. In., 250 H.P.:

Operating (Tappet) Clearance, Hot:

Intake: 1 Turn

Exhaust: 1 Turn

Valve Seat Angle:

Seat: 46 Degrees

Face 45 Degrees

Valve Spring Height Installed: 1.70"

Valve Spring Pressure: 200 Lbs @ 1.25"

Valve Stem Clearance:

Intake .001"-.0027"

Exhaust .001"-.0029"

Valve Stem Diameter:

Intake: .3410"-.3417"

Exhaust: .3410"-.3417"

8 Cylinder Engine, 454 Cu. In.:

Operating (Tappet) Clearance, Hot:

Intake: 1 Turn

Exhaust: 1 Turn

Valve Seat Angle:

Seat: 46 Degrees

Face 45 Degrees

Valve Spring Height Installed: 1.88"

Valve Spring Pressure: 300 Lbs @ 1.38"

Valve Stem Clearance:

Intake .001"-.0027"

Exhaust .0012"-.0027"

Valve Stem Diameter:

Intake: .3715"-.3722"

Exhaust: .3713"-.3722"

Pistons, Pins, Rings, Crankshaft, & Bearings Data:

8 Cylinder Engine, 350 Cu. In., 190 H.P.:

Piston Clearance: .0007"-.0013"

Ring End Gap:

Compression:

Top Ring: .010"

Lower Ring: .013"

Oil: .015

Wrist Pin Diameter: .9272"

Rod Bearings:

Shaft Diameter: 2.099"-2.100"

Rod Bearing Clearance: .0013"-.0035"

Main Bearings:

Shaft Diameter:

#1, 2, 3, & 4: 2.4484"-2.4493"

#5: 2.4479"-2.4488"

Main Bearing Clearance:

#1: .0008"-.0020"

# 2, 3, & 4: .0011"-.0023"

#5, .0017"-.0033"

Thrust on Rear Bearing: #5

Crankshaft End Play: .002"-.006"

8 Cylinder Engine, 350 Cu. In., 250 H.P.:

Piston Clearance: .0036"-.0042"

Ring End Gap:

Compression:

Top Ring: .010"

Lower Ring: .013"

Oil: .015

Wrist Pin Diameter: .9272"

Rod Bearings:

Shaft Diameter: 2.099"-2.100"

Rod Bearing Clearance: .0013"-.0035"

Main Bearings:

Shaft Diameter:

#1, 2, 3, & 4: 2.4484"-2.4493"

#5: 2.4479"-2.4488"

Main Bearing Clearance:

Standard Transmission:

#1, 2, 3, & 4: .0013"-.0025"

#5: .0023"-.0033"

Automatic Transmission:

#1: .0019"-.0031"

# 2, 3, & 4: .0013"-.0025"

#5, .0023"-.0033"

Thrust on Rear Bearing: #5

Crankshaft End Play: .002"-.006"

8 Cylinder Engine, 427 Cu. In.:

Piston Clearance: .0018"-.0028"

Ring End Gap:

Compression: .010"

Oil: .015"

Wrist Pin Diameter: .9897"

Rod Bearings:

Shaft Diameter: 2.199"-2.200"

Rod Bearing Clearance: .0009"-.0025"

Main Bearings:

Shaft Diameter:

#1: 2.7485"-2.7494"

2, 3, & 4: 2.7481"-2.7490"

#5: 2.7478"-2.7488"

Main Bearing Clearance:

#1, 2, 3, & 4: .0013"-.0025"

#5: .0024"-.0040"

Thrust on Rear Bearing: #5

Crankshaft End Play: .006"-.010"

Capacities:

350 Cu. In. Engine, 195 H.P.:

Cooling System:

Without Heater: 17 Quarts

With Heater: 19 Quarts

With Air Conditioning: 19 Quarts

Radiator Cap Pressure:

With Air Conditioning: 15 PSI

Without Air Conditioning: 15 PSI

Thermostat Opening Temperature: 195 Degrees

Fuel Tank: 18 Gallons

Engine Oil Refill: 5 Quarts with New Filter

Transmission Oil:

4 Speed Manual: 3 Pints

Automatic Transmission:

THM 250 & THM 350:

Refill: 2-1/2 Quarts

THM 400:

Refill: 3-1/2 Quarts

Rear Axle: 4 Pints

350 Cu. In. Engine, 250 H.P.:

Cooling System:

Without Heater: 17 Quarts

With Heater: 19 Quarts

With Air Conditioning: 19 Quarts

Radiator Cap Pressure:

With Air Conditioning: 15 PSI

Without Air Conditioning: 15 PSI

Thermostat Opening Temperature: 180 Degrees

Fuel Tank: 18 Gallons

Engine Oil Refill: 5 Quarts with New Filter

Transmission Oil:

Standard Transmission:

4 Speed: 3 Pints

Automatic Transmission:

THM 250 & THM 350:

Refill: 2-1/2 Quarts

THM 400:

Refill: 3-1/2 Quarts

Rear Axle: 4 Pints

454 Cu. In. Engine:

Cooling System:

Without Heater: 23 Quarts

With Heater: 24 Quarts

With Air Conditioning; 24 Quarts

Radiator Cap Pressure:

With Air Conditioning: 15 PSI

Without Air Conditioning: 15 PSI

Thermostat Opening Temperature: 195 Degrees

Fuel Tank: 18 Gallons

Engine Oil Refill: 5 Quarts with New Filter

Transmission Oil

4 Speed Manual: 3 Pints

Automatic Transmission:

THM 250 & THM 350:

Refill: 2-1/2 Quarts

THM 400:

Refill: 3-1/2 Quarts

Rear Axle: 4.0 Pints

Engine Tightening Specifications:

350 Cu. In. 8 Cylinder:

Spark Plugs: 15 Ft. Lbs

Cylinder Head Bolts: 65 Ft. Lbs.

Intake Manifold: 30 Ft. Lbs.

Exhaust Manifold:

Outside Bolts: 20 Ft. Lbs

Inside Bolts: 30 Ft. Lbs.

Rocker Arm Stud: 50 Ft. Lbs.

Rocker Arm Cover: 45 Inch Lbs.

Connecting Rod Cap Bolts: 45 Ft. Lbs.

Main Bearing Cap Bolts: 75 Ft. Lbs.

Outer Bolts on Engines with 4 Bolt Caps: 65 Ft. Lbs.

Flywheel to Crankshaft: 60 Ft. Lbs

Vibration Damper: 60 Ft. Lbs.

454 Cu. In. 8 Cylinder:

Spark Plugs: 15 Ft. Lbs

Cylinder Head Bolts: 80 Ft. Lbs.

Intake Manifold: 30 Ft. Lbs.

Exhaust Manifold: 20 Ft. Lbs

Rocker Arm Stud: 50 Ft. Lbs.

Rocker Arm Cover: 50 Inch Lbs.

Connecting Rod Cap Bolts: 50 Ft. Lbs

Main Bearing Cap Bolts: 110 Ft. Lbs.

Flywheel to Crankshaft: 65 Ft. Lbs

Vibration Damper: 85 Ft. Lbs.

Alternators:

8 Cylinder Engine:

#1100544

Rated Hot Output: 61 Amperes

Field Current @ 12 Volts, 80 Degrees: 4.0-4.5 Volts

Output @ 14 Volts, 5,000 RPM: 55 Amperes

Voltage Regulator: Integral

#1100950

Rated Hot Output: 42 Amperes

Field Current @ 12 Volts, 80 Degrees: 4.0-4.5 Volts

Output @ 14 Volts, 5,000 RPM: 37 Amperes

Voltage Regulator: Integral

Distributors:

8 Cylinder Engine:

#1112114

Centrifugal Advance Data:

Advance Starts: 0 Degrees @ 550 RPM

Intermediate Advance: 5-1/2 Degrees @ 1,200 RPM

Full Advance: 9 Degrees @ 2,100 RPM

Vacuum Advance Data:

Inches of Vacuum to Start Plunger: 6"

Maximum Vacuum Advance: 10 Degrees @ 15.7" Vacuum

#1112150

Centrifugal Advance Data:

Advance Starts: 0 Degrees @ 550 RPM

Intermediate Advance: 5-1/2 Degrees @ 1,200 RPM

Full Advance: 9 Degrees @ 2,100 RPM

Vacuum Advance Data:

Inches of Vacuum to Start Plunger: 10"

Maximum Vacuum Advance: 5 Degrees @ 15.5" Vacuum

#1112850

Centrifugal Advance Data:

Advance Starts: 0 Degrees @ 500 RPM

Intermediate Advance: 5 Degrees @ 900 RPM

Intermediate Advance: 7-1/2 Degrees @ 1,200 RPM

Full Advance: 11 Degrees @ 2,100 RPM

Vacuum Advance Data:

Inches of Vacuum to Start Plunger: 3"

Maximum Vacuum Advance: 14 Degrees @ 8.5" Vacuum

#1112851

Centrifugal Advance Data:

Advance Starts: 0 Degrees @ 550 RPM

Intermediate Advance: 5-1/2 Degrees @ 1,200 RPM

Full Advance: 9 Degrees @ 2,100 RPM

Vacuum Advance Data:

Inches of Vacuum to Start Plunger: 3"

Maximum Vacuum Advance: 14 Degrees @ 8.5" Vacuum

#1112854

Centrifugal Advance Data:

Advance Starts: 0 Degrees @ 500 RPM

Intermediate Advance: 6 Degrees @ 1,100 RPM

Full Advance: 10 Degrees @ 2,500 RPM

Vacuum Advance Data:

Inches of Vacuum to Start Plunger: 3"

Maximum Vacuum Advance: 14 Degrees @ 8.5" Vacuum

Starting Motors:

8 Cylinder, 350 Cu. In. Engine:

#1108418

Brush Tension: 35 Ounces (Minimum)

No Load Test: 65-95 Amps, 9 Volts @ 7,500-10,500 RPM

#1108430

Brush Tension: 35 Ounces (Minimum)

No Load Test: 65-95 Amps, 9 Volts @ 7,500-10,500 RPM

8 Cylinder, 454 Cu. In. Engines:

#1108429

Brush Tension: 35 Ounces (Minimum)

No Load Test: 65-95 Amps, 9 Volts @ 7,500-10,500 RPM

8 Cylinder, 427 Cu. In. Engines:

#1108400

Brush Tension: 35 Ounces (Minimum)

No Load Test: 65-95 Amps, 9 Volts @ 7,500-10,500 RPM

Brake Specifications:

Wheel Cylinder Bore:

Disk Brake:

Front 1-7/8"

Rear: 1-3/8"

Master Cylinder Bore:

Manual Disc Brakes: 1"

Power Disc Brakes: 1-1/8"

Rear Axle Specifications:

Carrier Type: Integral

Ring Gear & Pinion Backlash:

Method: Check with Dial Gauge

Adjustment: .005"-.008"

Pinion Bearing Preload:

Method: Spacer

New Bearing Adjustment: 20-25 Inch Lbs.

Used Bearing Adjustment: 5-10 Inch Lbs.

Differential Bearing Preload:

Method: Shims

New Bearing Adjustment: .010"

Used Bearing Adjustment: .010"

Wheel Alignment Specifictions:

Manual Steering:

Caster: + 1 Degrees

Camber: 3/4 Degrees

Toe In: 3/16 to 5/16""

Toe Out on Turns:

Inner Wheel: 20 Degrees

Power Steering:

Caster: + 2-/14 Degrees

Camber: 3/4 Degrees

Toe In: 3/16 to 5/16"

Toe Out on Turns:

Inner Wheel: 20 Degrees

Rear Wheel Alignment:

Camber: -7/8 Degrees

Toe In: 1/32" to 3/32"

Carburetor Types:

8 Cylinder Engines:

Rochester Quadrajet

Carburetor #7044221

Float Level: 3/8"

Pump Rod:

Hole: Inner

Adjustment: 13/32"

Fast Idle, Bench Adjustment: 2 Turns

Choke Rod: .430"

Vacuum Break: .250"

Air Valve Dashpot: .015"

Choke Unloader: .450"

Air Valve Valve Spring Wind-Up: 7/16"

Rochester Quadrajet

Carburetor #7044206. 7044207

Float Level: 1/4"

Pump Rod:

Hole: Inner

Adjustment: 13/32"

Fast Idle, Bench Adjustment: 2 Turns

Choke Rod: .430"

Vacuum Break: .230"

Air Valve Dashpot: .015"

Choke Unloader: .450"

Air Valve Valve Spring Wind-Up: 7/8"

Rochester Quadrajet

Carburetor #7044210, 7044211

Float Level: 1/4"

Pump Rod:

Hole: Inner

Adjustment: 13/32"

Fast Idle, Bench Adjustment: 2 Turns

Choke Rod: .430"

Vacuum Break: .230"

Air Valve Dashpot: .015"

Choke Unloader: .450"

Air Valve Valve Spring Wind-Up: 1 Turn

Rochester Quadrajet

Carburetor #7044225

Float Level: 3/8"

Pump Rod:

Hole: Inner

Adjustment: 13/32"

Fast Idle, Bench Adjustment: 2 Turns

Choke Rod: .430"

Vacuum Break: .230"

Air Valve Dashpot: .015"

Choke Unloader: .450"

Air Valve Valve Spring Wind-Up: 7/16"

Rochester Quadrajet

Carburetor #7044205

Float Level: 3/8"

Pump Rod:

Hole: Inner

Fast Idle, Bench Adjustment: 2 Turns

Choke Rod: .430"

Vacuum Break: .250"

Air Valve Dashpot: .015"

Choke Unloader: .450"

Air Valve Valve Spring Wind-Up: 7/16"

Rochester Quadrajet

Carburetor #7044506, 7044507

Float Level: 1/4"

Pump Rod:

Hole: Inner

Adjustment: 13/32"

Fast Idle, Bench Adjustment: 2 Turns

Choke Rod: .430"

Vacuum Break: .230"

Air Valve Dashpot: .015"

Choke Unloader: .450"

Air Valve Valve Spring Wind-Up: 7/8"

VIN Numbers:

1Z67J4S400001 - 1Z67J4S437502

OR

1Z37J4S400001 - 1Z37J4S437502

Popular Options:

Power Brakes; Power Steering; Custom Interior; Power Windows; Map Light; Custom Shoulder Belts; Detachable Hardtop; Vinyl Roof Covering for Detachable Hardtop; Rear Window Defroster; Tilt & Telescopic Steering Wheel; Custom Wheel Covers; Cast Aluminum Wheels; AM-FM Stereo Radio; AM-FM Radio; Heavy Duty Battery; Automatic Transmission; Off Road Suspension & Brake Package; Dual Horns; Engine Options.

Paint Colors:

Code Color

10 Classic White

14 Silver Mist

17 Corvette Gray

22 Medium Blue

48 Dark Green

56 BrightYellow

68 Dark Brown

74 Medium Red

76 Mille Migiia Red

80 Corvette Orange

1974 Corvette Promotional Model Cars Available:

Plastic: Corvette Sting Ray Coupe

1974 Corvette Historical Data:

1974 Corvette model year introduction date was on September 22, 1973.

Model Year Production: 37,502 Cars

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