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The 1975 Corvette

1975 Black Corvette Coupe

1975 was the last year for a convertible until 1986. It was the first year for catalytic converters as well as the first year for HEI (high energy ignition). 1975 also marks the first year since 1964 that only one engine displacement size was available. The rear "Rubber Bumper" was updated this year to be one piece, eliminating the seam down the middle. Internally both the front and rear bumpers were redesigned to improve low-speed crash survivability. The speedometer this year also included km/hr in a smaller type face than MPH in the US, in Canada it was reversed. This was the last year for "Astro Ventilation". This was the first year for the headlight warning "Buzzer". Zora Arkus-Duntov resigned from GM this year and Dave McLellan took over Corvette. Duntov bought his company 1974 Corvette from GM when he left, when he finally sold it he got more than $100,000 for it.

Production Options and Build Statistics

Total 1975 Corvettes Built - 38,465
Convertibles - 4,629
Coupes - 33,836

Convertible Serial Numbers: 1Z67x5S400001 through 1Z67x5S438465
Coupe Serial numbers: 1Z37x5S400001 through 1Z37x5S438465

The "Vehicle Identification Number" (also VIN or serial number) is stamped on a plate on the inner vertical surface of the left windshield pillar visible through the windshield.
Position Character Description
1 1 Chevrolet Division
2 Z Corvette
3 & 4 67 Convertible
37 Coupe
5 J ZQ3 350-cid V8, 165-hp, Four-Barrel
T L82 350-cid V8, 205-hp, Four-Barrel
6 5 1975
7 S Assembled in St. Louis, MO
8 to 13 400001 to 438465 Production Sequence

Engine Serial Number

1975 Corvette engines have the last six digits of the VIN stamped on the block just ahead of the cylinder head on the right-hand side combined with a three-letter engine code suffix . Also cast into the top rear of the block is a four-symbol code indicating when the engine was built for example B 23 5 which is for February 23, 1975.
Position Description
1 Month the block was cast
A-January
B-February
C-March
D-April
E-May
F-June
G-July
H-August
I-September
J-October
K-November
L-December
2-3 Two digit date the engine was built.
4 Single digit year. i.e. 5=1975


Position Character Description
1 to 7 0001001 Sequential Production Number
8 F or T Flint, MI or Tonawanda, NY
9 to 11 Carburetion & Transmission Code Engine Compression Transmission Carburetor
CUB 350-cid 165-hp V-8 8.5:1 Manual Four-Barrel
CUD 350-cid 205-hp V-8 9.0:1 Manual Four-Barrel
CRK 350-cid V-8   THM-400 automatic Four-Barrel
CRL 350-cid V-8   Manual Four-Barrel
CRM 350-cid V-8   THM-400 automatic Four-Barrel
CUT 350-cid V-8   Manual Four-Barrel
CUA 350-cid V-8   Manual Four-Barrel

The body number plate is located on the engine side of the cowl. The Fisher Body Style Number identifies the model of Corvette.
75-1YZ67 - Corvette Sting Ray convertible
75-1YZ37 - Corvette Sting Ray coupe
The body number is the serial number of the body. The trim number represents the color of the interior, the paint color is the exterior paint color.

Production Options

RPO Description Price Production
1YZ37 Base Coupe $6,797.10 33,836
1YZ67 Base Convertible $6,550.10 4,629
N/A Custom Interior Trim $154 N/A
A31 Power Windows $93 28,745
A51 Seat - Special Contour Bucket N/A N/A
A85 Custom Shoulder Belts std. w/ coupe $41 646
C07 Auxiliary Hardtop (convert.) $267 2,407
C08 Vinyl Covered Aux. Hardtop $350 279
C50 Rear Window Defroster $46 13,760
C60 Air Conditioning $490 31,914
FE7 Gymkhana Suspension $7.00 3,194
GV7 Optional Rear Axle Ratios $12.00 1,969
K50 Air Cleaner - Low Noise Cowl induction N/A N/A
J50 Power Brakes $55 35,842
L82 350ci. 205hp engine $336 2,372
M21 4-spd, Close Ratio Manual Trans. avail. only with L82 $0.00 1,057
M40 Turbo Hydra-Matic Auto. Trans. $0.00 28,473
N37 Tilt-Telescopic Steering Column $82 31,830
N41 Power Steering $129 37,591
QRM White Stripe Steel Belted Tires - GR70x15 $35 5,233
QRZ Raised White Letter Steel Belted Tires - GR70x15B $48 30,407
U05 Dual Horns $4.00 22,011
U58 AM-FM Radio Stereo - With 30" fixed height rear antenna $284 24,701
U69 AM-FM Radio $178 12,902
UA1 Heavy Duty Battery - Delco Energizer R89WPT $15 16,778
UF1 Map Light $5.00 21,676
VJ9 Sticker - Exhaust Emission N/A N/A
VK3 Plate - License Front Mounting N/A N/A
YF5 California Emissions Certification $20 3,037
Z07 Off Road Susp. and Brake Susp. $400 144

Color Options for 1975

Interior options for exterior colors are suggested by Chevrolet. Any combination could be ordered.
RPO Exterior Interior Production
10 Classic White B-DB-DR-MS-N-SI 8,007
13 Silver B-DB-DR-MS-SI 4,710
22 Bright Blue B-DB-SI 2,869
27 Steel Blue B-DB-SI 1,268
42 Bright Green B-MS-N-SI 1,664
56 Bright Yellow B-MS-N 2,883
67L Medium Saddle Metallic B-MS-N 3,403
70 Orange Flame B-MS-N 3,030
74 Dark Red B-DR-MS-N-SI 3,342
76 Mille Miglia Red B-DR-MS-N-SI 3,355
Color Codes: B=Black, CH=Charcoal, CM=Camel, DB=Dark Blue, DR=Dark Red, L=Leather, MS=Medium Saddle, N=Neutral, SI=Saddle V=Vinyl, W=White

Interior Colors

This information is suspect
Color Vinyl Upholstery Leather Upholstery
Black 400 404
Silver 406 407
Neutral 408  
Dark Blue 413  
Saddle 415 416
Dark Red 425  

RPO Color Production
14V SI/V N/A
19V B/V N/A
275 DB/V N/A
60V N/V N/A
65V MS/V N/A
73V DR/V N/A
142 SI/L N/A
192 B/L N/A
262 DB/L N/A
652 MS/L* N/A
732 DR/L N/A
Color Codes:  B=Black, CH=Charcoal, CM=Camel, DB=Dark Blue, DR=Dark Red, L=Leather, MS=Medium Saddle, N=Neutral, SI=Saddle V=Vinyl, W=White
*includes leather seat covers, special cut-pile carpeting, door trim panels with simulated wood-grained accents and lower carpeting, and console with simulated wood grained accents. Price:  $154.00

1975 Corvette Specifications

Mechanical Dimensions

Feature Convertible Coupe
Wheelbase 98 inches (2.489 m) 98 inches (2.489 m)
Overall length 185.5 inches (4.712 m) 185.5 inches (4.712 m)
Overall width 69.0 inches (1.753 m) 69.0 inches (1.753 m)
Overall height   47.4 inches (1.204 m)
Ground Clearance 4.5 inches (11.4 cm) 4.5 inches (11.4 cm)
Front tread 58.7 inches (1.491 m) 58.7 inches (1.491 m)
Rear tread 59.4 inches (1.509 m) 59.4 inches (1.509 m)
Tires F70-15 F70-15
Frame Full-length welded-steel ladder type with five cross members. Steel box sections, welded.
Front suspension Independent, unequal-length A-arms, coil springs; tubular shocks and stabilizer bar
Rear suspension Independent, trailing arms, toe links, transverse chromium-carbon steel leaf spring, tube shocks, and anti-roll bar
Steering Saginaw recirculating ball, 17.6:1 ratio, 2.9 turns to lock, 39.0 turning circle
Rear axle type Sprung differential, Hypoid gear
Brakes Hydraulic, vented four wheel discs; 11.75-inch diameter, single calipers, optional power assist
Swept area 11.75" front and back
Total swept area 461 sq. in.
Wheels 8" wide slotted steel 15" 5-lug disc
Standard rear axle ratio 3.36:1
Optional rear axle ratio 3.70:1, 3.08:1, 3.36:1, 3.55:1

Engine Specifications

Feature Base Engine RPO ZQ3 RPO L82
Type V-8, Overhead valve
Block Cast iron block
Displacement 350 cid 350 cid
Bore & Stroke 4.00 x 3.48" 4.00 x 3.48"
Compression ratio 8.5:1 9.0:1
Brake horsepower 165 @ 3800 205 @ 4800
Torque 255 lb-ft @ 2400 255 lb-ft @ 3600
Main bearing five
Valve lifters hydraulic
Camshaft   High-performance camshaft
Fuel supply Rochester Quadra-Jet Four-BarrelModel 4MV Rochester Quadra-Jet Four-Barrel

 


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