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The 1975 Corvette
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
Total 1975 Coupes - 33,836
Total 1975 Convertibles - 4,629
| Serial Numbers |
|---|
| Coupe | 1Z37x5S400001 - 1Z37x5S438465 | | Convertible | 1Z67x5S400001 - 1Z67x5S438465 |
Coupe Serial Numbers: 1Z37x5S400001 - 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.
Serial Number Decoder
| Position | Character | Description |
|---|
| 1 | 1 | Chevrolet Division | | 2 | Z | Corvette | | 3-4 | 67 | Convertible | | 3-4 | 37 | Coupe | | 5 | J | ZQ3 350-cid V8, 165-hp, Four-Barrel | | 5 | 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 Decoder
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 | Value | Description |
|---|
| 1 to 7 | Flint, MI or Tonawanda, NY | 0001001 | | | | | | 1 to 7 | Code | 0001001 | Engine | Compression | Transmission | Carburetor | | 1 to 7 | CUB | 0001001 | 350-cid 165-hp V-8 | 8.5:1 | Manual | Four-Barrel | | 1 to 7 | CUD | 0001001 | 350-cid 205-hp V-8 | 9.0:1 | Manual | Four-Barrel | | 1 to 7 | CRK | 0001001 | 350-cid V-8 | | THM-400 automatic | Four-Barrel | | 1 to 7 | CRL | 0001001 | 350-cid V-8 | | Manual | Four-Barrel | | 1 to 7 | CRM | 0001001 | 350-cid V-8 | | THM-400 automatic | Four-Barrel | | 1 to 7 | CUT | 0001001 | 350-cid V-8 | | Manual | Four-Barrel | | 1 to 7 | CUA | 0001001 | 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 | Cost | Total |
|---|
| Prod. | % |
|---|
| 1YZ37 | Base Coupe | $6,797.10 | 33,836 | 88.0% | | 1YZ67 | Base Convertible | $6,550.10 | 4,629 | 12.0% | | N/A | Custom Interior Trim | $154.00 | N/A | N/A | | A31 | Power Windows | $93.00 | 28,745 | 74.7% | | A51 | Seat - Special Contour Bucket | N/A | N/A | N/A | | A85 | Custom Shoulder Belts std. w/ coupe | $41.00 | 646 | 1.7% | | C07 | Auxiliary Hardtop (convert.) | $267.00 | 2,407 | 6.3% | | C08 | Vinyl Covered Aux. Hardtop | $350.00 | 279 | 0.7% | | C50 | Rear Window Defroster | $46.00 | 13,760 | 35.8% | | C60 | Air Conditioning | $490.00 | 31,914 | 83.0% | | FE7 | Gymkhana Suspension | $7.00 | 3,194 | 8.3% | | GV7 | Optional Rear Axle Ratios | $12.00 | 1,969 | 5.1% | | K50 | Air Cleaner - Low Noise Cowl induction | N/A | N/A | N/A | | J50 | Power Brakes | $55.00 | 35,842 | 93.2% | | L82 | 350ci. 205hp engine | $336.00 | 2,372 | 6.2% | | M21 | 4-spd, Close Ratio Manual Trans. avail. only with L82 | $0.00 | 1,057 | 2.7% | | M40 | Turbo Hydra-Matic Auto. Trans. | $0.00 | 28,473 | 74.0% | | N37 | Tilt-Telescopic Steering Column | $82.00 | 31,830 | 82.8% | | N41 | Power Steering | $129.00 | 37,591 | 97.7% | | QRM | White Stripe Steel Belted Tires - GR70x15 | $35.00 | 5,233 | 13.6% | | QRZ | Raised White Letter Steel Belted Tires - GR70x15B | $48.00 | 30,407 | 79.1% | | U05 | Dual Horns | $4.00 | 22,011 | 57.2% | | U58 | AM-FM Radio Stereo- With 30" fixed height rear antenna | $284.00 | 24,701 | 64.2% | | U69 | AM-FM Radio | $178.00 | 12,902 | 33.5% | | UA1 | Heavy Duty Battery- Delco Energizer R89WPT | $15.00 | 16,778 | 43.6% | | UF1 | Map Light | $5.00 | 21,676 | 56.4% | | VJ9 | Sticker - Exhaust Emission | N/A | N/A | N/A | | VK3 | Plate - License Front Mounting | N/A | N/A | N/A | | YF5 | California Emissions Certification | $20.00 | 3,037 | 7.9% | | Z07 | Off Road Susp. and Brake Susp. | $400.00 | 144 | 0.4% |
Color Options for 1975
Interior options for exterior colors are suggested by Chevrolet. Any combination could be ordered. | RPO | Color | Cost | Interior Color | Total |
|---|
| Prod. | % |
|---|
| 10 | Classic White | $0.00 | B-DB-DR-MS-N-SI | 8,007 | 20.8% | | 13 | Silver | $0.00 | B-DB-DR-MS-SI | 4,710 | 12.2% | | 22 | Bright Blue | $0.00 | B-DB-SI | 2,869 | 7.5% | | 27 | Steel Blue | $0.00 | B-DB-SI | 1,268 | 3.3% | | 42 | Bright Green | $0.00 | B-MS-N-SI | 1,664 | 4.3% | | 56 | Bright Yellow | $0.00 | B-MS-N | 2,883 | 7.5% | | 67L | Medium Saddle Metallic | $0.00 | B-MS-N | 3,403 | 8.8% | | 70 | Orange Flame | $0.00 | B-MS-N | 3,030 | 7.9% | | 74 | Dark Red | $0.00 | B-DR-MS-N-SI | 3,342 | 8.7% | | 76 | Mille Miglia Red | $0.00 | B-DR-MS-N-SI | 3,355 | 8.7% |
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
| RPO | Color | Cost | Total |
|---|
| Prod. | % |
|---|
| 400 | Black Vinyl | $0.00 | N/A | N/A | | 404 | Black Leather | $0.00 | N/A | N/A | | 406 | Silver Vinyl | $0.00 | N/A | N/A | | 407 | Silver Leather | $0.00 | N/A | N/A | | 408 | Neutral Vinyl | $0.00 | N/A | N/A | | 413 | Dark Blue Vinyl | $0.00 | N/A | N/A | | 415 | Saddle Vinyl | $0.00 | N/A | N/A | | 416 | Saddle Leather | $0.00 | N/A | N/A | | 425 | Dark Red Vinyl | $0.00 | N/A | N/A |
1975 Corvette Specifications
Mechanical Dimensions
| Feature | Coupe | Convertible |
|---|
| 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. | 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 | 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 | 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 | Saginaw recirculating ball, 17.6:1 ratio, 2.9 turns to lock, 39.0 turning circle | | Rear axle type | Sprung differential, Hypoid gear | Sprung differential, Hypoid gear | | Brakes | Hydraulic, vented four wheel discs 11.75-inch diameter, single calipers, optional power assist | Hydraulic, vented four wheel discs 11.75-inch diameter, single calipers, optional power assist | | Swept area | 11.75" front and back | 11.75" front and back | | Total swept area | 461 sq. in. | 461 sq. in. | | Wheels | 8" wide slotted steel 15" 5-lug disc | 8" wide slotted steel 15" 5-lug disc | | Standard rear axle ratio | 3.36:1 | 3.36:1 | | Optional rear axle ratio | 3.70:1, 3.08:1, 3.36:1, 3.55:1 | 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 | V-8, Overhead valve | | Block | Cast iron 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 | five | | Valve lifters | hydraulic | hydraulic | | Camshaft | | High-performance camshaft | | Fuel supply | Rochester Quadra-Jet Four-BarrelModel 4MV | Rochester Quadra-Jet Four-Barrel |
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