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The 1974 Corvette

1974 Yellow Corvette Coupe Ad

The 1974 Chevrolet Corvette is the first with rear "Rubber Bumpers". The new shape removes the spoiler at the back of the car and replaces it with a smooth down-sloping deck. The bumper could not be manufactured reliably in one piece this year. The solution was to manufacture it in two pieces and put them together, this resulted in a seam down the middle of all the '74 models. The new bumper added 30 more pounds to the car. Due to the weight changes, minor suspension changes were made to the front and rear springs. This was the last year for the "Big Block" and the last year that catalytic converters were not used. Cast aluminum wheels were on the order sheet but due to manufacturing problems none were actually delivered. A new "Gymkhana" option was introduced that beefed up the spring rates and suspension.

Production Options and Build Statistics

Total 1974 Corvettes Built - 37,502

Total 1974 Coupes - 32,028
Total 1974 Convertibles - 5,474

Serial Numbers
Coupe1Z37x4S400001 - 1Z37x4S437502
Convertible1Z67x4S400001 - 1Z67x4S437502

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

PositionCharacterDescription
11Chevrolet Division
2ZCorvette
3-467Convertible
3-437Coupe
5JQ3 350-cid V8, 195-hp, Four-Barrel
5TL82 350-cid V8, 250-hp, Four-Barrel
5ZLS4 454-cid V8, 270-hp, Four-Barrel
641974
7SAssembled in St. Louis, MO
8 to 13400001 to 437502Production Sequence

Engine Serial Number Decoder

1974 Corvette engines have the last six digits of the VIN stamped on the block after the engine number

PositionValueDescription
1 to 70001001Sequential Production Number
8F or TFlint, MI or Tonawanda, NY
9 to 119 to 11Carburetion & TransmissionCarburetion & Transmission350-cid 195-hp V-89.0:1Manual
9 to 119 to 11Carburetion & TransmissionCarburetion & Transmission350-cid 195-hp V-89.0:14-speed Manual with NB2
9 to 119 to 11Carburetion & TransmissionCarburetion & Transmission350-cid 195-hp V-89.0:1THM-400 Automatic
9 to 119 to 11Carburetion & TransmissionCarburetion & Transmission350-cid 195-hp V-89.0:1THM-400 Automatic with NB2
9 to 119 to 11Carburetion & TransmissionCarburetion & Transmission350-cid 250-hp V-89.0:14-speed Manual
9 to 119 to 11Carburetion & TransmissionCarburetion & Transmission454-cid 270-hp V-88.25:14-speed Manual
9 to 119 to 11Carburetion & TransmissionCarburetion & Transmission454-cid 270-hp V-88.25:1THM-400 Automatic
9 to 119 to 11Carburetion & TransmissionCarburetion & Transmission454-cid 270-hp V-88.25:1THM-400 Automatic with NB2

The body number plate is located on the engine side of the cowl. The Fisher Body Style Number identifies the model of Corvette. 74-1YZ67 - Corvette Sting Ray convertible 74-1YZ37 - 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.
%
1YZ37Base Coupe$6,001.50 32,028 85.4%
1YZ67Base Convertible$5,765.50 5,474 14.6%
N/ACustom Interior Trim$154.00 19,959 53.2%
A31Power Windows$86.00 23,940 63.8%
A85Custom Shoulder Beltsstd. w/ coupe$41.00 618 1.6%
C07Auxiliary Hardtop (convert. only)$267.00 2,612 7.0%
C08Vinyl Covered Aux. Hardtop$329.00 367 1.0%
C50Rear Window Defroster$43.00 9,322 24.9%
C60Air Conditioning$467.00 29,397 78.4%
FE7Gymkhana Suspension$7.00 1,905 5.1%
N/AOptional Rear Axle Ratios$12.00 1,219 3.3%
J50Power Brakes$49.00 33,306 88.8%
LS4454ci. 270hp engine$250.00 3,494 9.3%
L82350ci. 250hp engine$299.00 6,690 17.8%
M214-spd, Close Ratio Manual Trans.$0.00 3,494 9.3%
M40Turbo Hydra-Matic Auto. Trans.$0.00 25,146 67.1%
N37Tilt-Telescopic Steering Column$82.00 27,700 73.9%
N41Power Steering$117.00 35,944 95.8%
QRMWhite Stripe Steel Belted Tires - GR70x15$32.00 9,140 24.4%
QRZWhite Letter Steel Belted Tires - GR70x15$45.00 24,102 64.3%
U05Dual Horns$4.00 5,258 14.0%
U58AM-FM Radio Stereo$276.00 19,581 52.2%
U69AM-FM Radio$173.00 17,374 46.3%
UA1Heavy Duty Battery (std. w/ LS4)$15.00 9,169 24.4%
UF1Map Light$5.00 16,101 42.9%
YF5California Emissions Certification$20.00 N/A N/A
Z07Off Road Susp. and Brake Susp.$400.00 47 0.1%

Color Options for 1974

Interior options for exterior colors are suggested by Chevrolet. Any combination could be ordered.
RPO
Color
Cost
Soft Top Color
Interior Color
Total
Prod.
%
10Classic White$0.00B/WB-DB-DR-MS-N-S-SI N/A N/A
14Silver Mist$0.00B/WB-DB-DR-S-SI N/A N/A
17Corvette Gray$0.00B/WB-DB-DR-N-S-SI N/A N/A
22Corvette Medium Blue$0.00B/WB-DB-SI N/A N/A
48Dark Green$0.00B/WB-N-S-SI N/A N/A
56Bright Yellow$0.00B/WB-N-S-SI N/A N/A
68Dark Brown$0.00B/WB-N-S-SI N/A N/A
74Dark Red$0.00B/WB-DR-N-S-SI N/A N/A
76Mille Miglia Red$0.00B/WB-DR-N-S-SI N/A N/A
80Corvette Orange$0.00B/WB-N-S-SI N/A N/A
Color Codes: B=Black, DB=Dark Blue, DR=Dark Red, L=Leather, N=Neutral, S=Saddle, SI=Silver V=Vinyl, W=White

Interior Colors

RPO
Color
Cost
Total
Prod.
%
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


1974 Corvette Specifications

Mechanical Dimensions

FeatureCoupeConvertible
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)
TiresF70-15F70-15
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, 3.55:1, 4.11:13.70:1, 3.08:1, 3.36:1, 3.55:1, 4.11:1


Engine Specifications

FeatureBase Engine RPO ZQ3RPO LS4RPO L82
TypeV-8, Overhead valveV-8, Overhead valveV-8, Overhead valve
BlockCast IronCast IronCast Iron
Displacement350 cid454 cid350 cid
Bore & Stroke4.00 x 3.48"4.251 x 4.00"4.00 x 3.48"
Compression Ratio9.0:18.25:19.0:1
Brake Horsepower195 @ 4400270 @ 4400250 @ 5200
Torque275 lb-ft @ 2800380 lb-ft @ 2800285 lb-ft @ 4000
Main Bearingfivefivefive
Valve LiftersHydraulicHydraulicHydraulic
CamshaftHigh-performanceHigh-performance
Fuel SupplyRochester Quadra-Jet Four-Barrel Model 4MVRochester Quadra-Jet Four-BarrelRochester Four-Barrel with 2.50-inch Diameter Dual Exhaust system
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