BLOCK CODES:
A - January
B - February
C - March
D - April
E - May
F - June
G - July
H - August
I - September
J - October
K - November
L - December
CASTING NUMBERS:
3892657 - 327
3869942 - 427
3904351 - 427
3916321 - 427
ENGINE SUFFIX CODE:
HE - 327ci, 300hp (1x4 Holley Carb and Manual Transmission)
HH - 327ci, 300hp (1x4 Holley Carb, K19 & Manual Transmission)
HO - 327ci, 300hp (1x4 Holley Carb & Powerglide Automatic Transmission)
HR - 327ci, 300hp (1x4 Holley Carb, K19 & Powerglide Automatic Transmission)
HP - 327ci, 300hp (1x4 Holley Carb, P/S & Manual Transmission)
HT - 327ci, 350hp (1x4 Holley Carb, Hi-Lift Cam & 4-Speed Manual Transmission)
HD - 327ci, 350hp (1x4 Holley Carb, Hi-LiftCam, K19 & 4-Speed Manual Transmission)
HP - 327ci, 350hp (1x4 Holley Carb, Hi-Lift Cam, A/C, P/S & 4-Speed Manual Transmission)
KH - 327ci, 350hp (1x4 Holley Carb, Hi-L Cam, K19, A/C, P/S, 4-Speed Manual Transmission)
IL - 427ci, 390hp (1x4 Holley Carb, Special Cam, Hydaulic Lifters & 4-Speed Transmission)
IM - 427ci, 390hp (1x4 Holley Carb, Special Cam, Hydaulic Lifter, K19, 4-Sped Transmission)
IQ - 427ci, 390hp (1x4 Holley Carb, Special Cam, Hydaulic Lifters, Auto Transmission)
IR - 427ci, 390hp (1x4 Holley Carb, Special Cam, Hydaulic Lifters, K19, Auto Transmission)
JC - 427ci, 400hp (L36 Engine w/3x2 Holley Carb & 4-Speed Transmission)
JF - 427ci, 400hp (L36 Engine w/3x2 Holley Carb, K19 & 4-Speed Transmission)
JD - 427ci, 400hp (L36 Engine w/3x2 Holley Carb & Powerglide Transmission)
JG - 427ci, 400hp (L36 Engine w/3x2 Holley Carb, K19 & Powerglide Transmission)
JE - 427ci, 435hp (3x2 Holley Carb, Mechanical Lifters & 4-Speed Transmission)
JA - 427ci, 435hp (3x2 Holley Carb, Mechanical Lifters, K19 & 4-Speed Transmission)
IU - 427ci, 435hp (3x2 Holley Carb, L71 Engine w/Aluminum Heads, 4-Speed Transmission)
JH - 427ci, 435hp (3x2 Holley Carb, L71 Engine w/Aluminum Heads, K19, 4-Speed Transmission)
IT - 427ci, 430hp (1x4 Holley Carb, Heavy-Duty Engine, M22 4-Speed Transmission)