Engine Numbers on Type 4 Motors

On Type 4 (Pancake motors) the engine number can be found stamped on the top of the crankcase above the cooling fan.
The first two letters relate to the following

Code CC BHP
CA 1700 66
CB 1700 66
CD 1700 66
AP 1800 68
CJ 2000 70
GD 2000 70
GE 2000 70