1975 Corvette

1975 Corvette Performance & Specifications

Powertrain, Steering, Brakes, Dimensions, & Suspension

The 1975 Chevy Corvette, along with the automotive industry as a whole, would experience a significant transformation at the onset of the new model year.  Because of serious health issues and environmental contamination associated with the use of lead fuel, it was determined that the automotive industry would – and should – phase it out.

Read More: 1975 Chevrolet Corvette Research Center

1975 Corvette Specifications

1975 Corvette Main Specs

MODEL: 1975 Chevrolet Corvette
BODY STYLE: Two-door convertible/coupe, front engine, rear wheel drive
MANUFACTURING LOCATION: St. Louis, Missouri
CONSTRUCTION: Uniconstruction: fiberglass reinforced plastic (FRP or “fiberglass”) body, backboned by a steel cage outlining the passenger compartment. Principal members – underbody, front and rear end assemblies, dash panel and hinge pillars are bonded, riveted, or bolted together and to each other. Hood is plastic with bonded plastic reinforcement. Coupe: two removable roof panels and removable rear window. Frame: all welded, full length, ladder construction with 5 crossmembers. Side Rails and intermediate crossmembers box section; front crossmember box girder section. Eight body-mounting points.
VEHICLE NUMBERS (VIN):
1Z37J5S400001 – 1Z37J5S438465
ENGINE SUFFIX: CHA: 350 CUBIC INCH, 165 HORSEPOWER, MANUAL
CHB: 350 CUBIC INCH, 165 HORSEPOWER, AUTOMATIC
CHC: 350 CUBIC INCH, 205 HORSEPOWER, MANUAL
CHR: 350 CUBIC INCH, 205 HORSEPOWER, AUTOMATIC, CALIFORNIA EMISSIONS
CHU: 350 CUBIC INCH, 165 HORSEPOWER, MANUAL
CHZ: 350 CUBIC INCH, 165 HORSEPOWER, AUTOMATIC, CALIFORNIA EMISSIONS
CKC: 350 CUBIC INCH, 205 HORSEPOWER, AUTOMATIC
CRJ: 350 CUBIC INCH, 165 HORSEPOWER, MANUAL
CRK: 350 CUBIC INCH, 165 HORSEPOWER, AUTOMATIC
CRL: 350 CUBIC INCH, 205 HORSEPOWER, MANUAL
CRM: 350 CUBIC INCH, 205 HORSEPOWER, AUTOMATIC
CUA: 350 CUBIC INCH, 165 HORSEPOWER, MANUAL
CUB: 350 CUBIC INCH, 165 HORSEPOWER, MANUAL
CUD: 350 CUBIC INCH, 205 HORSEPOWER, MANUAL
CUB: 350 CUBIC INCH, 205 HORSEPOWER, MANUAL
ENGINE BLOCK NUMBER: 3970010: 350 CUBIC INCH, 180 HP, 210HP
HEAD NUMBER: 333882: 350 CUBIC INCH, 180HP, 210HP
CARBURETOR NUMBERS: ROCHESTER Q-jet #17056206: 350 CUBIC INCH, 180HP, AUTOMATIC TRANSMISSION
ROCHESTER Q-jet #17056207: 350 CUBIC INCH, 180HP, MANUAL TRANSMISSION
ROCHESTER Q-jet #17056210: 350 CUBIC INCH, 210HP, AUTOMATIC TRANSMISSION
ROCHESTER Q-jet #17056211: 350 CUBIC INCH, 210HP, MANUAL TRANSMISSION
ROCHESTER Q-jet #17056226: 350 CUBIC INCH, 210HP, AUTOMATIC TRANSMISSION
ROCHESTER Q-jet #17056506: 350 CUBIC INCH, 180HP, AUTOMATIC TRANSMISSION
ROCHESTER Q-jet #17056507: 350 CUBIC INCH, 180HP, MANUAL TRANSMISSION
DISTRIBUTOR NUMBER: 1103200: 350 CUBIC INCH, 210HP, MANUAL
1112888: 350 CUBIC INCH, 180HP
1112905: 350 CUBIC INCH, 180HP, AUTOMATIC, CALIFORNIA EMISSIONS
1112979: 350 CUBIC INCH, 210HP, AUTOMATIC
ALTERNATOR NUMBER: 1102474: 350 CUBIC INCH, AIR CONDITIONING
1102484: 350 CUBIC INCH, WITHOUT AIR CONDITIONING
AXLE IDENTIFICATION NUMBER AA: 3.55:1 RATIO
AB: 3.70:1 RATIO
AC: 4.11:1 RATIO
AY: 2.73:1 RATIO
AW: 3.08:1 RATIO
AX: 3.36:1 RATIO
LR: 3.36:1 RATIO
PRODUCTION ENDING VEHICLE: OCT., 1974: 402385, FEB., 1975: 417112, JUN., 1975: 433474, NOV.. 1974: 406180, MAR., 1975: 420856, JUL, 1975: 438465, DEC., 1974: 409190, APR., 1975: 425228, JAN., 1975: 413159, MAY, 1975: 429379

1975 Corvette Powertrain Specifications

Order Code Standard L82
Manufacturing Location Flint, Michigan Flint, Michigan
Type 90 degree V, Valve-In-Head 90 degree V, Valve-In-Head
Cylinders 8 8
Displacement (cid) 350 350
Fuel Induction System 4-Barrel Carburetor 4-Barrel Carburetor
Horsepower 165 @ 4,400 205 @ 4,800
Torque 255 @ 2,400 255 @ 3,600
Bore x Stroke (in.) 4.00 x 3.48 4.00 x 3.48
Compression Ratio 8.5:1 9.0:1
Valve Lifters Hydraulic Hydraulic
Firing Order 1-8-4-3-6-5-7-2 1-8-4-3-6-5-7-2
Cylinder Number System (Left) 1-3-5-7 1-3-5-7
Cylinder Number System (Right) 2-4-6-8 2-4-6-8
Recommended Fuel Premium Premium

1975 Corvette Manual Transmission/Gear Ratios

Manual Transmission

Gear Ratios 
4-Speed (RPO M20)
4-Speed Close Ratio (RPO M21)
1st Gear:
2.64:1
2.43:1
2nd Gear:
1.75:1
1.61:1
3rd Gear:
1.33:1
1.23:1
4th Gear:
1.00:1
1.00:1
Reverse:
2.55:1
2.35:1

Clutch

Clutch Stats
Type Single Dry Disk Centrifugal (Dual Dry Disk for LT1)
Spring Pressure (lbs) 2450 – 2750
Lining area (sq. in.) 123.7

Turbo Hydra-Matic Automatic Transmission RPO M40/ Gear Ratios

Gear Drive L2 L1 Reverse
1st Gear 2.48:1 2.48:1 2.48:1 N/A
2nd Gear 1.48:1 1.48:1 N/A N/A
3rd Gear 1.00:1 N/A N/A N/A
Reverse N/A N/A N/A 2.08

1975 Corvette Wheels, Suspension & Brakes

Suspension – Front

Type and Description: Independent, SLA type, coil springs with center mounted shock absorbers, spherical joint steering knuckle pivots.

Front Coil Springs
Make & Type Coil
Material Steel Alloy
Size 10.27 x 3.80; 130.84 x 0.606
Front Stabilizer Bar
Type Link
Material Hot rolled steel
Diameter .8125 with 350ci engine, .875 with 454ci engine

Suspension – Back

Type and Description: Full Independent rear suspension with frame-anchored differential unit. Position of each wheel established by three links: tubular axle drive shafts, transverse strut rods, torque control arms. Vertical suspension loads taken by transverse leaf springs. Built-in camber adjustment at strut rod inner ends.
Rear Leaf Springs
Number of Leaves Variable rate 9-leaf
Material Chrome carbon steel
Length, width, height 48.60 x 2.25 x 2.121
Rear Strut
Material Forged Steel
Diameter 0.75

Brakes

Brake Specs
Type:
– Standard Caliper Disk – 4 Wheel Hydraulic
– J50 Delco Moraine, vacuum power unit; integral
Drum diameter, front (in.): 11.75 x 1.25
Drum diameter, rear (in.): 11.75 x 1.25
Swept Drum Area Effective area: 249.14

Wheels & Tires

Wheels & Tires Specs
Wheel Type:
– Standard Short spoke spider, welded steel
Wheels, size:
– Standard 15″ x 8.00
Tire, size:
– Standard GR70 x 15B — Blackwall Steel Belted Radial
– QRM GR70 x 15B — White Stripe Steel Belted Radial
– QRZ GR70 x 15B — White Letter Steel Belted Radial
Inflation
– Front 20 psi (cold), 30 psi (hot)
– Rear 20 psi (cold), 30 psi (hot)

Steering

Steering Specs – Manual Steering
Type Semi-reversible gear with ball-nut driven by recirculating anti-friction bearings, energy-absorbing steering column, steering damper attached to relay rod; two position steering knuckle arm attachment for street and fast ratio steering. Adjustable steering column available optionally.
Make Saginaw
Ratio (Street) 20.2:1
Ratio (Fast) 17.6:1
Ratio (Power) 17.6:1
Wheel Diameter (in.) 15
Turns, Stop to Stop
– Street 3.4
– Fast 2.92
– Power 2.92
Turning Diameter 37 ft. (outside front), 38.8 ft. (outside front)

1975 Corvette

1975 Corvette Exterior Dimensions

Hard Top Dimensions

Exterior Dimensions (Hardtop) Interior Dimensions (Hardtop)
Wheelbase: 98.0 Inches Headroom: 36.0 Inches
Overall Length: 185.5 Inches Shoulder Room: 47.9 Inches
Total Body Width: 69.0 Inches Hip Room: 48.8 Inches
Overall Height: 48.1 Inches Leg Room: 42.1 Inches
Front Track Width: 58.7 Inches
Rear Track Width: 59.5 Inches
Min. Ground Clearance 4.3 Inches

Soft Top Dimensions

Exterior Dimensions (Soft Top) Interior Dimensions (Soft Top)
Wheelbase: 98.0 Inches Headroom: 37.1 Inches
Overall Length: 185.2 Inches Shoulder Room: 47.9 Inches
Total Body Width: 69.0 Inches Hip Room: 48.8 Inches
Overall Height: 48.2 Inches Leg Room: 42.1 Inches
Front Track Width: 58.7 Inches
Rear Track Width: 59.4 Inches
Min. Ground Clearance 4.5 Inches

Coupe Dimensions

Exterior Dimensions (Coupe) Interior Dimensions (Coupe)
Wheelbase: 98.0 Inches Headroom: 36.2 Inches
Overall Length: 185.2 Inches Shoulder Room: 47.9 Inches
Total Body Width: 69.0 Inches Hip Room: 48.8 Inches
Overall Height: 48.1 Inches Leg Room: 42.1 Inches
Front Track Width: 58.7 Inches
Rear Track Width: 59.5 Inches
Min. Ground Clearance 4.3 Inches

Capacities

Capacities
Passenger Capacity 2 – Driver & Passenger
Curb Weight (lbs) 3,542
Interior Passenger Volume (cu. ft) 6.5
Interior Trunk Volume (cu. ft) 18
Fuel Capacity (gallons): 4.0 for 350ci. engines  (capacity of crankcase less filter – refill)
Coolant capacity without heater (qts.) 19 for Base engine
18 for L82 engine
Battery: 12 Volt, 78 Plates, 3,250 Watts for 350ci. engines
12 Volt, 90 Plates, 4,000 Watts for Heavy Duty

1975 Corvette

1975 Corvette Performance Results

4-Speed Transmission
Base L82
Performance weight (lbs.)
3733
3746
Pounds/net horsepower
22.62
18.27
Pounds/cu.in. piston displacement
10.66
10.70
Net horsepower/cu.in. displacement
.471
.586
Power displacement (cu.ft./mile)
258.61
273.23
Displacement factor (cu.ft./mile)
138.29
138.69
0 – 60 mph (seconds)
Top Speed (mph)
Quarter Mile (secs @ mph)
Turbo Hydra-Matic Automatic Base  L82
Performance weight (lbs.)
3787 3800
 Pounds/net horsepower 22.95
18.54
Pounds/cu.in. piston displacement
10.82
10.86
Net horsepower/cu.in. displacement
.471
.586
Power displacement (cu.ft./mile)
237.06
258.61
Displacement factor (cu.ft./mile)
125.43
136.11
0 – 60 mph (seconds)
7.7
Top Speed (mph)
Quarter Mile (secs @ mph)
16.12 @ 87.4

1975 Corvette