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) |