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:
3958174 - 327
3892657 - 327
3855961 - 427
3869942 - 427
ENGINE SUFFIX CODE:
HE - 327ci, 300hp (Manual Transmission)
HH - 327ci, 300hp (K19 & Manual Transmission)
HO - 327ci, 300hp (Powerglide Automatic Transmission)
HR - 327ci, 300hp (K19 & Powerglide Automatic Transmission)
HT - 327ci, 350hp (Hi-LiftCam & 4-Speed Manual Transmission)
HD - 327ci, 350hp (Hi-Lift Cam, K19 & 4-Speed Manual Transmission)
HP - 327ci, 350hp (Hi-Lift Cam, A/C, P/S & 4-Speed Manual Transmission)
KH - 327ci, 350hp (Hi-Lift Cam, K19, AJC, P/S, 4-Speed Manual Transmission)
IL - 427ci, 390hp (Special Cam, Hydraulic Lifters & 4-Speed Manual Transmission)
IM - 427ci, 390hp (Special Cam, Hydraulic Lifters, K19 & 4-Speed Manual Transmission)
IQ - 427ci, 390hp (Special Cam, Hydraulic Lifters & Powerglide Automatic Transmission)
IR - 427ci, 390hp (Special Cam, Hydraulic Lifters, K19 & Powerglide Automatic Transmission)
IP - 427ci, 425hp (Special Cam, Mechanical Lifters & 4-Speed Manual Transmission)
IK - 427ci, 425hp (Special Cam, Mechanical Lifters, M22 4-Speed Manual Transmission)