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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
Convertibles - 5,474
Coupes - 32,028

Convertible Serial Numbers: 1Z67x4S400001 to 1Z67x4S437502
Coupe Serial numbers: 1Z37x4S400001 to 1Z37x4S437502

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 Q3 350-cid V8, 195-hp, Four-Barrel
T L82 350-cid V8, 250-hp, Four-Barrel
Z LS4 454-cid V8, 270-hp, Four-Barrel
6 4 1974
7 S Assembled in St. Louis, MO
8 to 13 400001 to 437502 Production Sequence

Engine Serial Number

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

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
CKZ 350-cid 195-hp V-8 9.0:1 Manual Four-Barrel
CLB 350-cid 195-hp V-8 9.0:1 4-speed Manual with NB2 Four-Barrel
CLA 350-cid 195-hp V-8 9.0:1 THM-400 Automatic Four-Barrel
CLC 350-cid 195-hp V-8 9.0:1 THM-400 Automatic with NB2 Four-Barrel
CLR 350-cid 250-hp V-8 9.0:1 4-speed Manual Four-Barrel
CWM 454-cid 270-hp V-8 8.25:1 4-speed Manual Four-Barrel
CWR 454-cid 270-hp V-8 8.25:1 THM-400 Automatic Four-Barrel
CWS 454-cid 270-hp V-8 8.25:1 THM-400 Automatic with NB2 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.
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 Price Production
1YZ37 Base Coupe $6,001.50 32,028
1YZ67 Base Convertible $5,765.50 5,474
N/A Custom Interior Trim $154 19,959
A31 Power Windows $86 23,940
A85 Custom Shoulder Beltsstd. w/ coupe $41 618
C07 Auxiliary Hardtop (convert. only) $267 2,612
C08 Vinyl Covered Aux. Hardtop $329 367
C50 Rear Window Defroster $43 9,322
C60 Air Conditioning $467 29,397
FE7 Gymkhana Suspension $7.00 1,905
N/A Optional Rear Axle Ratios $12.00 1,219
J50 Power Brakes $49 33,306
LS4 454ci. 270hp engine $250 3,494
L82 350ci. 250hp engine $299 6,690
M21 4-spd, Close Ratio Manual Trans. $0.00 3,494
M40 Turbo Hydra-Matic Auto. Trans. $0.00 25,146
N37 Tilt-Telescopic Steering Column $82 27,700
N41 Power Steering $117 35,944
QRM White Stripe Steel Belted Tires - GR70x15 $32 9,140
QRZ White Letter Steel Belted Tires - GR70x15 $45 24,102
U05 Dual Horns $4.00 5,258
U58 AM-FM Radio Stereo $276 19,581
U69 AM-FM Radio $173 17,374
UA1 Heavy Duty Battery (std. w/ LS4) $15 9,169
UF1 Map Light $5.00 16,101
YF5 California Emissions Certification $20 N/A
Z07 Off Road Susp. and Brake Susp. $400 47

Color Options for 1974

Interior options for exterior colors are suggested by Chevrolet. Any combination could be ordered.

RPO Exterior Interior Soft Top Production
10 Classic White B-DB-DR-MS-N-S-SI B/W N/A
14 Silver Mist B-DB-DR-S-SI B/W N/A
17 Corvette Gray B-DB-DR-N-S-SI B/W N/A
22 Corvette Medium Blue B-DB-SI B/W N/A
48 Dark Green B-N-S-SI B/W N/A
56 Bright Yellow B-N-S-SI B/W N/A
68 Dark Brown B-N-S-SI B/W N/A
74 Dark Red B-DR-N-S-SI B/W N/A
76 Mille Miglia Red B-DR-N-S-SI B/W N/A
80 Corvette Orange B-N-S-SI B/W 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

Color Vinyl RPO Leather RPO
Black 400 404
Silver 406 407
Neutral 408 ;
Dark Blue 413 ;
Saddle 415 416
Dark Red 425 ;

1974 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, 4.11:1

Engine Specifications

Feature Base Engine RPO ZQ3 RPO LS4 RPO L82
Type V-8, Overhead valve
Block Cast Iron
Displacement 350 cid 454 cid 350 cid
Bore & Stroke 4.00 x 3.48" 4.251 x 4.00" 4.00 x 3.48"
Compression Ratio 9.0:1 8.25:1 9.0:1
Brake Horsepower 195 @ 4400 270 @ 4400 250 @ 5200
Torque 275 lb-ft @ 2800 380 lb-ft @ 2800 285 lb-ft @ 4000
Main Bearing five
Valve Lifters Hydraulic
Camshaft ; High-performance High-performance
Fuel Supply Rochester Quadra-Jet Four-Barrel Model 4MV Rochester Quadra-Jet Four-Barrel Rochester Four-Barrel with 2.50-inch Diameter Dual Exhaust system

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