All engines are stamped with an engine ID code, consisting of assembly plant code, production date and suffix code. V8 codes are stamped on a pad just forward of the right side (passenger) cylinder head. 6 cylinder engines are stamped on the passenger side of the block behind the distributor. The block casting number on small block and big block Chevy V-8 engine's are located on the ledge found at the rear of the block, most often on the driver's side. This ledge forms the mating surface between the block and the transmission bell housing. These particular codes designate the specific powerplant that was installed in the vehicle at the factory. Note, this is a general reference.

Code	Power plant	Equipment
AA	194-200 HP	Manual Transmission
AC	194-200 HP	Heavy Duty Clutch
AG	194-200 HP	Manual Transmission & A/C
AH	194-200 HP	Heavy Duty Clutch & A/C
AK	194-200 HP	Taxi Equipment
AL	194-200 HP	Powerglide Automatic
AN	194-200 HP	Powerglide & Taxi Equipment
AR	194-200 HP	Powerglide & A/C
CA	230-140 HP	Manual Transmission
CB	230-140 HP	Manual Transmission & A/C
CC	230-140 HP	Powerglide Automatic
CD	230-140 HP	Powerglide & A/C
DA	283-195 HP	3-Speed Manual Transmission
DB	283-195 HP	4-Speed Manual Transmission
DE	283-195 HP	Powerglide Automatic
DG	283-220 HP	Manual Transmission
DH	283-220 HP	Powerglide Automatic
EA	327-250 HP	Manual Transmission
EE	327-250 HP	Powerglide Automatic
EB	327-300 HP	Manual Transmission
EF	327-300 HP	Powerglide Automatic
EC	327-350 HP	Manual Transmission
ED	327-350 HP	Manual Transmission & Transistor Ignition
IX	396-375 HP	Manual Transmission