LRDG,
If you go by part nos there is not much interchangability but a lot of that reflects improvements in materials and fits. The difference in pistons seems to be primarily about wrist pin retention. Crank I think is interchangable, C4 still has the redundant front oil pump mount in the front housing. Rings need to go with the piston. Cylinders bolt on but there are lots of bits on the outside that are different (air deflectors, throttle linkage, rocker covers, oil recovery pipes) Supercharger gears and impeller are different but not sure about the housing. It is about 20 years since I looked at this in detail but complete engines were fairly cheap then so I never needed to build a mongrel.
You are about to become an expert in all this I think.
David
Last edited by David Herbert; 24-01-14 at 23:01.
Reason: Correcting more miss-information.
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