Below is a listing of identification numbers for the 1971 Corvette including engine block, head id, casting numbers and more.
| VIN Tag Information |
194371S100001 - 194371S121801 (coupe)
194671S100001 - 194671S121801 (convertible) |
| Digit |
Definition |
| 1st |
Division: 1 = Chevrolet |
| 2nd / 3rd |
Series: 94 = Corvette |
| 4th/5th |
Body Style: 37 = 2-door coupe, 67 = 2-door convertible |
| 6th |
Model Year: 1 = 1971 |
| 7th |
Assembly Plant: S = St. Louis, MO. |
| Last 6 digits |
Production Number starting with 100001 - 121801 |
| Engine Suffix ID Numbers |
| CGT: |
350ci, 270hp (automatic transmission) |
| CGY: |
350ci, 330hp (manual transmission, ZR1) |
| CGZ: |
350ci, 330hp (manual transmission, LT1) |
| CJK: |
350ci, 270hp (automatic transmission) |
| CJL: |
350ci, 270hp (manual transmission) |
| CPH: |
454ci, 365hp (manual transmission) |
| CPJ: |
454ci, 365hp (automatic transmission) |
| CPW: |
454ci, 425hp (aluminum heads, manual transmission) |
| CPX: |
454ci, 425hp (aluminum heads, automatic transmission) |
| Block ID Numbers |
| 3970010: |
350ci, 270hp, 330hp |
| 3963512: |
454ci, 365hp, 425hp |
| Head ID Numbers |
| 3946074: |
454ci, 425hp |
| 3973487: |
350ci, 270hp, 330hp |
| 3993820: |
454ci, 365hp |
| 3994026: |
454ci, 425hp (uncertain use) |
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 |
Two main plants were casting Chevrolet engine parts during 1970: Flint, Michigan and Tonawanda, New York.
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
| Carburetor ID Numbers |
| Rochester Q-jet #7041204: |
454ci, 365hp (automatic transmission) |
| Rochester Q-jet #7041205: |
454ci, 365hp (manual transmission) |
| Rochester Q-jet #7041212: |
350ci, 270hp (automatic transmission) |
| Rochester Q-jet #7041213: |
350ci, 2790hp (manual transmission) |
| Holley R4801A #3989021: |
350ci, 330hp (manual transmission) |
| Holley R4802A #3986195: |
454ci, 425hp (manual transmission) |
| Holley R4803A #3986196: |
454ci, 425hp (automatic transmission) |
| Distributor ID Numbers |
| 1112038: |
350ci, 330hp (transistor ignition) |
| 1112050: |
350ci, 270hp |
| 1112051: |
454ci, 365hp |
| 1112053: |
454ci, 425hp (automatic transmission, transistor ignition) |
| 1112076: |
454ci, 425hp (manual transmission, transistor ignition) |
| Alternator ID Numbers |
| 1100543: |
454ci, 365hp, 425hp |
| 1100950: |
350ci, 270hp, 330hp |
| 1100544: |
All with air conditioning. |
Trim Tag and Location:
