Below is a listing of common identification numbers for the 1974 Corvette including engine block, head id, casting numbers and more.
| Vehicle Identification Number |
| 1Z37J4S400001 - 1Z37J4S440606 |
| Digit |
Definition |
| 1st |
1 = GM Division = Chevrolet |
| 2nd |
Z = Series = Corvette |
| 3rd/4th |
Body Style: 37 = Coupe, 67 = Convert |
| 5th |
Engine Type: J = L48, T = L82, Z = LS4 |
| 6th |
4 = Model Year = 1974 |
| 7th |
Assembly Plant: S = St. Louis, MO. |
| Last 6 digits |
Production Number starting with 400001 and up. |
| Engine Suffix ID Numbers |
| CKZ: |
350ci, 195hp, (manual transmission) |
| CLA: |
350ci, 195hp, (automatic transmission) |
| CLB: |
350ci, 195hp, (manual transmission, California emissions) |
| CLC: |
350ci, 195hp, (automatic transmission, California emissions) |
| CLD: |
350ci, 250hp, (automatic transmission) |
| CLH: |
350ci, 250hp, (automatic transmission, California emissions) |
| CLR: |
350ci, 250hp, (manual transmission) |
| CLS: |
350ci, 250hp (California emissions, manual transmission) |
| CWM: |
454ci, 270hp (manual transmission) |
| CWR: |
454ci, 270hp (automatic transmission) |
| CWS: |
454ci, 270hp, (automatic transmission, California emissions) |
| CWT: |
454ci, 270hp, (California emissions, manual transmission) |
| Block ID Numbers |
| 3970010: |
350ci, 195hp, 250hp |
| 3999289: |
454ci, 270hp |
| Head ID Numbers |
| 333882: |
350ci, 195hp, 250hp |
| 336781: |
454ci, 270hp |
| Carburetor ID Numbers |
| Rochester Q-jet #7044221: |
454ci, 270hp (manual transmission) |
| Rochester Q-jet #7044206: |
350ci, 195hp (automatic transmission) |
| Rochester Q-jet #7044207: |
350ci, 195hp (manual transmission) |
| Rochester Q-jet #70445210: |
350ci, 250hp (automatic transmission) |
| Rochester Q-jet #7044211: |
350ci, 250hp (manual transmission) |
| Rochester Q-jet #7044225: |
454ci, 270hp (automatic transmission) |
| Rochester Q-jet #7044505: |
454ci, 270hp (automatic transmission, California emissions) |
| Rochester Q-jet #7044506: |
350ci, 250hp (automatic transmission, California emissions) |
| Rochester Q-jet #7044507: |
350ci, 250hp (California emissions, manual transmission) |
Cylinder Head Casting Number:
The cylinder head casting number is usually found on top of the cylinder head in between two valves and the rocker arm studs.
Cylinder Head Casting Date:
The cylinder head casting date is usually found adjacent to the cylinder head casting number. The casting date code is an alphanumeric sequenced number. The first digit is usually a letter which specifies the month that the block was cast. Some casting dates have been found with all digits being numbers, the first of which corresponds to the month.
| Cylinder Head Casting Number Month Codes (1st Digit) |
| A - January |
E - May |
I - September |
| B - February |
F - June |
J - October |
| C - March |
G - July |
K - November |
| D - April |
H - August |
L - December |
Example: Flint Cylinder Head Casting Number - D 19 9
- D: Month = April
- 19: Casting Day = 19th
- 9: Casting Year = 1959
Example: Tonawanda Cylinder Head Casting Number - D 19 59
- D: Month = April
- 19: Casting Day = 19th
- 59: Casting Year = 1959
| Distributor ID Numbers |
| 1112114: |
454ci, 270hp |
| 1112150: |
350ci, 250hp |
| 1112247: |
350ci, 195hp |
| 1112544: |
350ci, 195hp (California emissions, manual transmission) |
| 1112850: |
350ci, 195hp (California emissions, manual transmission) |
| 1112851: |
350ci, 195hp (automatic transmission, California emissions) |
| 1112853: |
350ci, 250hp (automatic transmission) |
| Alternator ID Numbers |
| 1100544: |
All engines with air conditioning. |
| 1100950: |
All engines without air conditioning. |