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
Six Cylinders
CBA	250-110 HP	3 or 4 Speed Manual A/C
CBD	250-110 HP	3 Speed Manual A/C
CBG	250-110 HP	3 Speed Manual
CBJ	250-110 HP	Powerglide Automatic
CBK	250-110 HP	Powerglide Automatic
CDL	250-110 HP	Powerglide Automatic A/C
CDM	250-110 HP	Manual Transmission A/C
CSD	250-110 HP	Powerglide Automatic A/C
Eight Cylinders
CAY	307-130 HP	3 or 4 Speed Manual A/C
CAZ	307-130 HP	Powerglide Automatic A/C
CKG	307-130 HP	Manual Transmission
CKH	307-130 HP	Powerglide Automatic
CMA	307-130 HP	350 Turbohydramatic Automatic A/C
CTK	307-130 HP	350 Turbohydramatic Automatic
CAR	350-165 HP	350 Turbohydramatic Automatic A/C
CDA	350-165 HP	3 or 4 Speed Manual A/C
CDG	350-165 HP	3 or 4 Speed Manual A/C
CKA	350-165 HP	3 or 4 Speed Manual
CKB	350-165 HP	350 Turbohydramatic Automatic
CMD	350-165 HP	350 Turbohydramatic Automatic A/C
CSH	350-165 HP	350 Turbohydramatic Automatic
CTL	350-165 HP	350 Turbohydramatic Automatic
CDD	350-175 HP	350 Turbohydramatic Automatic A/C
CKD	350-175 HP	350 Turbohydramatic Automatic
CKK	350-175 HP	4 Speed Manual
CLA	402-240 HP	4 Speed Manual
CLB	402-240 HP	400 Turbohydramatic Automatic
CLS	402-240 HP	3 Speed Manual
CTA	402-240 HP	3 or 4 Speed Manual A/C
CTB	402-240 HP	400 Turbohydramatic Automatic A/C
CTH	402-240 HP	3 Speed Manual
CTJ	402-240 HP	400 Turbohydramatic Automatic A/C
CPA	454-270 HP	3 or 4 Speed Manual
CPD	454-270 HP	400 Turbohydramatic Automatic
CRW	454-270 HP	400 Turbohydramatic Automatic A/C
CRX	454-270 HP	3 or 4 Speed Manual A/C