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The 1974 Corvette
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.
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Position
|
Character
|
Description
|
|
1
|
1
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Chevrolet Division
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2
|
Z
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Corvette
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3 & 4
|
67
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Convertible
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37
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Coupe
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5
|
J
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Q3 350-cid V8, 195-hp, Four-Barrel
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T
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L82 350-cid V8, 250-hp, Four-Barrel
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Z
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LS4 454-cid V8, 270-hp, Four-Barrel |
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6
|
4
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1974
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7
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S
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Assembled in St. Louis, MO
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8 to 13
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400001 to 437502
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Production Sequence
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Engine Serial Number
1974 Corvette engines have the last six digits of the VIN stamped on the block after
the engine number
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Position
|
Character
|
Description
|
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1 to 7
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0001001
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Sequential Production Number
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8
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F or T
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Flint, MI or Tonawanda, NY
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9 to 11
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Carburetion & Transmission
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Code
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Engine
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Compression
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Transmission
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Carburetor
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CKZ
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350-cid 195-hp V-8
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9.0:1
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Manual
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Four-Barrel
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CLB
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350-cid 195-hp V-8
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9.0:1
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4-speed Manual with NB2
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Four-Barrel
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CLA
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350-cid 195-hp V-8
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9.0:1
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THM-400 Automatic
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Four-Barrel
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CLC
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350-cid 195-hp V-8
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9.0:1
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THM-400 Automatic with NB2
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Four-Barrel
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CLR
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350-cid 250-hp V-8
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9.0:1
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4-speed Manual
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Four-Barrel
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CWM
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454-cid 270-hp V-8
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8.25:1
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4-speed Manual
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Four-Barrel
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CWR
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454-cid 270-hp V-8
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8.25:1
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THM-400 Automatic
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Four-Barrel
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CWS
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454-cid 270-hp V-8
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8.25:1
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THM-400 Automatic with NB2
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Four-Barrel
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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 |
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U05 |
Dual Horns |
$4.00 |
5,258 |
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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 |
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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 |
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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
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Color
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Vinyl RPO
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Leather RPO |
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Black
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400
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404
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Silver
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406
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407
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Neutral
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408
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Dark Blue
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413
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Saddle
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415
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416
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Dark Red
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425
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1974 Corvette Specifications
Mechanical Dimensions
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Feature
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Convertible
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Coupe
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Wheelbase
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98 inches (2.489 m)
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98 inches (2.489 m)
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Overall length
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185.5 inches (4.712 m)
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185.5 inches (4.712 m)
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Overall width
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69.0 inches (1.753 m)
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69.0 inches (1.753 m)
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Overall height
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47.4 inches (1.204 m)
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Ground Clearance
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4.5 inches (11.4 cm)
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4.5 inches (11.4 cm)
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Front tread
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58.7 inches (1.491 m)
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58.7 inches (1.491 m)
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Rear tread
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59.4 inches (1.509 m)
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59.4 inches (1.509 m)
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Tires
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F70-15
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F70-15
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Frame
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Full-length welded-steel ladder type with five cross members. Steel box sections,
welded.
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Front suspension
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Independent, unequal-length A-arms, coil springs; tubular shocks and stabilizer
bar
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Rear suspension
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Independent, trailing arms, toe links, transverse chromium-carbon steel leaf spring,
tube shocks, and anti-roll bar
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Steering
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Saginaw recirculating ball, 17.6:1 ratio, 2.9 turns to lock, 39.0 turning circle
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Rear axle type
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Sprung differential, Hypoid gear
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Brakes
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Hydraulic, vented four wheel discs; 11.75-inch diameter, single calipers, optional
power assist
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Swept area
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11.75" front and back
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Total swept area
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461 sq. in.
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Wheels
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8" wide slotted steel 15" 5-lug disc
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Standard rear axle ratio
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3.36:1
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Optional rear axle ratio
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3.70:1, 3.08:1, 3.36:1, 3.55:1, 4.11:1
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Engine Specifications
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Feature
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Base Engine RPO ZQ3 |
RPO LS4
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RPO L82
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Type
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V-8, Overhead valve
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Block
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Cast Iron |
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Displacement
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350 cid
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454 cid
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350 cid
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Bore & Stroke
|
4.00 x 3.48"
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4.251 x 4.00"
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4.00 x 3.48"
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Compression Ratio
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9.0:1
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8.25:1
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9.0:1
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Brake Horsepower
|
195 @ 4400
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270 @ 4400
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250 @ 5200
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Torque
|
275 lb-ft @ 2800
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380 lb-ft @ 2800
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285 lb-ft @ 4000
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Main Bearing
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five
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Valve Lifters
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Hydraulic
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Camshaft
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High-performance
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High-performance
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Fuel Supply
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Rochester Quadra-Jet Four-Barrel Model 4MV
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Rochester Quadra-Jet Four-Barrel
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Rochester Four-Barrel with 2.50-inch Diameter Dual Exhaust system
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