| Engine Suffix ID Numbers |
| HD: |
327ci, 350hp (air injection reactor, manual transmission) |
| HE: |
327ci, 300hp (manual transmission) |
| HH: |
327ci, 300hp (air injection reactor, manual transmission) |
| HO: |
327ci, 300hp (automatic transmission) |
| HP: |
327ci, 350hp (air conditioning, manual transmission, power steering) |
| HR: |
327ci, 300hp (air injection reactor, automatic transmission) |
| HT: |
327ci, 350hp (manual transmission) |
| IL: |
427ci, 390hp (manual transmission) |
| IM: |
427ci, 390hp (air injection reactor, manual transmission) |
| IQ: |
427ci, 390hp (automatic transmission) |
| IR: |
427ci, 390hp (air injection reactor, automatic transmission) |
| IT: |
427ci, 430hp (L88), (manual transmission) |
| IU: |
427ci, 435hp (aluminum heads, manual transmission) |
| JA: |
427ci, 435hp (air injection reactor, manual transmission) |
| JC: |
427ci, 400hp (manual transmission) |
| JD: |
427ci, 400hp (automatic transmission) |
| JE: |
427ci, 435hp (manual transmission) |
| JF: |
427ci, 400hp (air injection reactor, manual transmission) |
| JG: |
427ci, 400hp (air injection reactor, automatic transmission) |
| JH: |
427ci, 435hp (air injection reactor, aluminum heads, manual transmission) |
| KH: |
327ci, 350hp (air conditioning, air injection reactor, manual transmission, power steering) |
| Head ID Numbers |
| 3890462: |
327ci, 300hp, 350hp |
| 3904390: |
427ci, 390hp, 400hp (early production) |
| 3904391: |
427ci, 435hp (early production, iron heads) |
| 3904392: |
427ci, 430hp, 435hp (aluminum heads) |
| 3909802: |
427ci, 390hp, 400hp (late production) |
| 3919840: |
427ci, 435hp (iron heads, late production) |
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 1967: 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 |
| Holley R3418A: |
427ci, 430hp (L88) |
| Holley R3659A: |
427ci, 400hp, 435hp (front carburetor, rear carburetor) |
| Holley R3660A: |
427ci, 400hp (center carburetor, manual transmission), 435hp (center carburetor) |
| Holley R3810A: |
327ci, 300hp, 350hp |
| Holley R3814A: |
327ci, 300hp, 350hp (air injection reactor) |
| Holley R3811A: |
427ci, 390hp |
| Holley R3815A: |
427ci, 390hp (air injection reactor) |
| Holley R3888A: |
427ci, 400hp (automatic transmission, center carburetor) |
| Distributor ID Numbers |
| 1111117: |
327ci, 300hp (automatic transmission) |
| 1111157: |
327ci, 350hp (transistor ignition) |
| 1111194: |
327ci, 300hp (manual transmission) |
| 1111196: |
327ci, 350hp |
| 1111258: |
427ci, 435hp (transistor ignition) |
| 1111141: |
427ci, 390hp (early production) |
| 1111240: |
427ci, 430hp (L88) |
| 1111247: |
427ci, 390hp, 400hp |
| 1111248: |
427ci, 390hp, 400hp (early production, transistor ignition) |
| 1111294: |
427ci, 390hp, 400hp (transistor ignition) |