37.502 Corvettes were built in 1974. 32.028 Coupe and 5.474 Convertibles.
The Vehicle Identification Numbers, VIN were 1Z37J4S400001 through 1Z37J4S437502
For convertibles, third digit is a 6
Fifth digit varies as follows: J=350 CID 195 HP / T=350 CID 250 HP / Z=454 CID 270 HP

Cubic Inch 350 350 454
HP @ RPM 195 @ 4400 250 @ 5200 270 @ 4400
Torque  RPM 275 @ 2800 285 @ 4000 380 @ 2800
Comp. Ratio 8.5:1 9.0:1 8.25:1
Bore & Stroke 4.000 X 3.480 4.000 X 3.480 4.251 X 4.000
Carburator 4bbl Rochester 4bbl Rochester 4bbl Rochester
In Manifold NIY1 NIY NIY
Valve Lifters NIY NIY NIY
Exhaust NIY NIY NIY
Oil Capacity 4 QT 4 QT 5 QT
Spark Plugs R44T R44T R44T
1 = No Information Yet
3970010 350 CID - 195 HP & 250 HP
3999289 454 CID - 270 HP
333882 350 CID - 195 HP & 250 HP
336781 454 CID - 270 HP
350 Cubic Inch Engine CODE
195 HP with 4-Speed CKZ
195 HP with 4-Speed (California) CLB
195 HP with Turbo Hydra-Matic CLA
195 HP with Turbo Hydra-Matic (California) CLC
250 HP with 4-Speed CLR
250 HP with 4-Speed (California) CLS
250 HP with Turbo Hydra-Matic CLD
250 HP with Turbo Hydra-Matic (California) CLH
454 Cubic Inch Engine CODE
270 HP with 4-Speed CWM
270 HP with 4-Speed (California) CWT
270 HP with Turbo Hydra-Matic CWR
270 HP with Turbo Hydra-Matic (California) CWS
Ratio and Type CODE
2.73 Positraction AV
3.08 Positraction AW
3.36 Positraction AX, LR
3.55 Positraction AA
3.70 Positraction AB
4.11 Positraction AC
Color CODE
Classic White 10
Silver Mist 14
Corvette Gray 17
Corvette Med Blue 22
Dark Green 48
Bright Yellow 56
Dark Brown 68
Medium Red 74
Mille Miglia Red 76
Corvette Orange 80
© Tommy Ledberg