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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

Total 1975 Coupes - 33,836
Total 1975 Convertibles - 4,629

Serial Numbers
Coupe1Z37x5S400001 - 1Z37x5S438465
Convertible1Z67x5S400001 - 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

11Chevrolet Division
5JZQ3 350-cid V8, 165-hp, Four-Barrel
5TL82 350-cid V8, 205-hp, Four-Barrel
7SAssembled in St. Louis, MO
8 to 13400001 to 438465Production 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.

1 to 7Flint, MI or Tonawanda, NY0001001
1 to 7Code0001001EngineCompressionTransmissionCarburetor
1 to 7CUB0001001350-cid 165-hp V-88.5:1ManualFour-Barrel
1 to 7CUD0001001350-cid 205-hp V-89.0:1ManualFour-Barrel
1 to 7CRK0001001350-cid V-8THM-400 automaticFour-Barrel
1 to 7CRL0001001350-cid V-8ManualFour-Barrel
1 to 7CRM0001001350-cid V-8THM-400 automaticFour-Barrel
1 to 7CUT0001001350-cid V-8ManualFour-Barrel
1 to 7CUA0001001350-cid V-8ManualFour-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

1YZ37Base Coupe$6,797.10 33,836 88.0%
1YZ67Base Convertible$6,550.10 4,629 12.0%
N/ACustom Interior Trim$154.00 N/A N/A
A31Power Windows$93.00 28,745 74.7%
A51Seat - Special Contour BucketN/A N/A N/A
A85Custom Shoulder Belts std. w/ coupe$41.00 646 1.7%
C07Auxiliary Hardtop (convert.)$267.00 2,407 6.3%
C08Vinyl Covered Aux. Hardtop$350.00 279 0.7%
C50Rear Window Defroster$46.00 13,760 35.8%
C60Air Conditioning$490.00 31,914 83.0%
FE7Gymkhana Suspension$7.00 3,194 8.3%
GV7Optional Rear Axle Ratios$12.00 1,969 5.1%
K50Air Cleaner - Low Noise Cowl inductionN/A N/A N/A
J50Power Brakes$55.00 35,842 93.2%
L82350ci. 205hp engine$336.00 2,372 6.2%
M214-spd, Close Ratio Manual Trans. avail. only with L82$0.00 1,057 2.7%
M40Turbo Hydra-Matic Auto. Trans.$0.00 28,473 74.0%
N37Tilt-Telescopic Steering Column$82.00 31,830 82.8%
N41Power Steering$129.00 37,591 97.7%
QRMWhite Stripe Steel Belted Tires - GR70x15$35.00 5,233 13.6%
QRZRaised White Letter Steel Belted Tires - GR70x15B$48.00 30,407 79.1%
U05Dual Horns$4.00 22,011 57.2%
U58AM-FM Radio Stereo- With 30" fixed height rear antenna$284.00 24,701 64.2%
U69AM-FM Radio$178.00 12,902 33.5%
UA1Heavy Duty Battery- Delco Energizer R89WPT$15.00 16,778 43.6%
UF1Map Light$5.00 21,676 56.4%
VJ9Sticker - Exhaust EmissionN/A N/A N/A
VK3Plate - License Front MountingN/A N/A N/A
YF5California Emissions Certification$20.00 3,037 7.9%
Z07Off 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.
Interior Color
10Classic White$0.00B-DB-DR-MS-N-SI 8,007 20.8%
13Silver$0.00B-DB-DR-MS-SI 4,710 12.2%
22Bright Blue$0.00B-DB-SI 2,869 7.5%
27Steel Blue$0.00B-DB-SI 1,268 3.3%
42Bright Green$0.00B-MS-N-SI 1,664 4.3%
56Bright Yellow$0.00B-MS-N 2,883 7.5%
67LMedium Saddle Metallic$0.00B-MS-N 3,403 8.8%
70Orange Flame$0.00B-MS-N 3,030 7.9%
74Dark Red$0.00B-DR-MS-N-SI 3,342 8.7%
76Mille Miglia Red$0.00B-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

400Black Vinyl$0.00 N/A N/A
404Black Leather$0.00 N/A N/A
406Silver Vinyl$0.00 N/A N/A
407Silver Leather$0.00 N/A N/A
408Neutral Vinyl$0.00 N/A N/A
413Dark Blue Vinyl$0.00 N/A N/A
415Saddle Vinyl$0.00 N/A N/A
416Saddle Leather$0.00 N/A N/A
425Dark Red Vinyl$0.00 N/A N/A

1975 Corvette Specifications

Mechanical Dimensions

Wheelbase98 inches (2.489 m)98 inches (2.489 m)
Overall length185.5 inches (4.712 m)185.5 inches (4.712 m)
Overall width69.0 inches (1.753 m)69.0 inches (1.753 m)
Overall height47.4 inches (1.204 m)
Ground Clearance4.5 inches (11.4 cm)4.5 inches (11.4 cm)
Front tread58.7 inches (1.491 m)58.7 inches (1.491 m)
Rear tread59.4 inches (1.509 m)59.4 inches (1.509 m)
FrameFull-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 suspensionIndependent, unequal-length A-arms, coil springs tubular shocks and stabilizer barIndependent, unequal-length A-arms, coil springs tubular shocks and stabilizer bar
Rear suspensionIndependent, trailing arms, toe links, transverse chromium-carbon steel leaf spring, tube shocks, and anti-roll barIndependent, trailing arms, toe links, transverse chromium-carbon steel leaf spring, tube shocks, and anti-roll bar
SteeringSaginaw recirculating ball, 17.6:1 ratio, 2.9 turns to lock, 39.0 turning circleSaginaw recirculating ball, 17.6:1 ratio, 2.9 turns to lock, 39.0 turning circle
Rear axle typeSprung differential, Hypoid gearSprung differential, Hypoid gear
BrakesHydraulic, vented four wheel discs 11.75-inch diameter, single calipers, optional power assistHydraulic, vented four wheel discs 11.75-inch diameter, single calipers, optional power assist
Swept area11.75" front and back11.75" front and back
Total swept area461 sq. in.461 sq. in.
Wheels8" wide slotted steel 15" 5-lug disc8" wide slotted steel 15" 5-lug disc
Standard rear axle ratio3.36:13.36:1
Optional rear axle ratio3.70:1, 3.08:1, 3.36:1, 3.55:13.70:1, 3.08:1, 3.36:1, 3.55:1

Engine Specifications

FeatureBase Engine RPO ZQ3RPO L82
TypeV-8, Overhead valveV-8, Overhead valve
BlockCast iron blockCast iron block
Displacement350 cid350 cid
Bore & Stroke4.00 x 3.48"4.00 x 3.48"
Compression ratio8.5:19.0:1
Brake horsepower165 @ 3800205 @ 4800
Torque255 lb-ft @ 2400255 lb-ft @ 3600
Main bearingfivefive
Valve liftershydraulichydraulic
CamshaftHigh-performance camshaft
Fuel supplyRochester Quadra-Jet Four-BarrelModel 4MVRochester Quadra-Jet Four-Barrel

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