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
BA	230-140 HP	Manual Transmission
BC	230-140 HP	Heavy Duty Clutch
BD	230-140 HP	Air Conditioning
BB	230-140 HP	Heavy Duty Clutch & A/C
BF	230-140 HP	Powerglide Automatic
BH	230-140 HP	Powerglide Automatic & A/C
CM	250-155 HP	Manual Transmission
CN	250-155 HP	Manual Transmission & A/C
CQ	250-155 HP	Powerglide Automatic
CR	250-155 HP	Powerglide Automatic & A/C
DA	307-200 HP	Manual Transmission
DB	307-200 HP	4-Speed Manual Transmission
DN	307-200 HP	Heavy Duty Clutch
DE or DF	307-200 HP	Powerglide Automatic
EA	327-210 HP	Manual Transmission
EO	327-210 HP	Heavy Duty Clutch
EC or EE	327-210 HP	Powerglide Automatic
EH	327-275 HP	Manual Transmission
EJ	327-275 HP	Heavy Duty Clutch
EI	327-275 HP	Powerglide Automatic
EP	327-325 HP	Manual Transmission
ES	327-325 HP	Heavy Duty Clutch
ED	396-325 HP	Manual Transmission
EK	396-325 HP	Powerglide Automatic
ET	396-325 HP	Turbohydramatic Automatic
EF	396-350 HP	Manual Transmission
EL	396-350 HP	Powerglide Automatic
EU	396-350 HP	Turbohydramatic Automatic
EG	396-375 HP	Manual Transmission