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
CA	230-140 HP	Manual Transmission
BC	230-140 HP	Heavy Duty Clutch
BB	230-140 HP	Heavy Duty Clutch & A/C
CB	230-140 HP	Manual Transmission & A/C
BN	230-140 HP	Manual Transmission & Air Injection Reactor
BO	230-140 HP	Manual Transmission, A/C & Air Injection Reactor
CC	230-140 HP	Powerglide Automatic
CD	230-140 HP	Powerglide Automatic & A/C
BL	230-140 HP	Powerglide Automatic & Air Injection Reactor
CT	230-140 HP	Powerglide Automatic, A/C & Air Injection Reactor
CM	250-155 HP	Manual Transmission
CN	250-155 HP	Manual Transmission & A/C
CO	250-155 HP	Manual Transmission & Air Injection Reactor
CP	250-155 HP	Manual Transmission A/C & Air Injection Reactor
CQ	250-155 HP	Powerglide Automatic
CR	250-155 HP	Powerglide Automatic & A/C
CS	250-155 HP	Powerglide Automatic & Air Injection Reactor
CT	250-155 HP	Powerglide Automatic, A/C & Air Injection Reactor
DA	283-195 HP	Manual Transmission
DB	283-195 HP	4-Speed Manual Transmission
DI	283-195 HP	Manual Transmission & Air Injection Reactor
DK	283-195 HP	4-Speed Manual Transmission & Air Injection Reactor
DN	283-195 HP	Heavy Duty Clutch
DE	283-195 HP	Powerglide Automatic
DJ	283-295 HP	Powerglide Automatic & Air Injection Reactor
EA	327-275 HP	Manual Transmission
EQ	327-275 HP	Heavy Duty Clutch
EB	327-275 HP	Manual Transmission & Air Injection Reactor
EE	327-275 HP	Powerglide Automatic
EC	327-275 HP	Powerglide Automatic & Air Injection Reactor
EP	327-325 HP	Manual Transmission
ER	327-325 HP	Manual Transmission & Air Injection Reactor
ES	327-325 HP	Heavy Duty Clutch
ED	396-325 HP	Manual or Powerglide Automatic Transmission
EK	396-325 HP	Powerglide Automatic
EH	396-325 HP	Manual Transmission & Air Injection Reactor
EM	396-325 HP	Powerglide Automatic & Air Injection Reactor
ET	396-325 HP	Turbohydramatic Automatic
EV	396-325 HP	Turbohydramatic & Air Injection Reactor
EF	396-350 HP	Manual Transmission
EJ	396-350 HP	Manual Transmission & Air Injection Reactor
EL	396-350 HP	Powerglide Automatic
EN	396-350 HP	Powerglide Automatic & Air Injection Reactor
EU	396-350 HP	Turbohydramatic Automatic
EW	396-350 HP	Turbohydramatic & Air Injection Reactor
EG	396-375 HP	Manual Transmission
EX	396-375 HP	Manual Transmission & Air Injection Reactor