I don't know too much about rebuilding marine engines. I have experience in rebuilding diesle engines for trucks and I am currently getting into building up performance engines for mud trucks and muscle cars. My Dad however has a boat with a Murcury 502 in it and he is wanting to rebuild it. I have looked up stroker kits, cams, heads, and other parts for the 502 but I have no idea if they would work for a boat, seeing that boats unlike a mud truck or street rod stay at a constant RPM and obviously have to keep the fact that they are in water. Basically would any good engine performance parts work with a 502 in a boat from any regular performance dealer or do I have to find marine specific parts? Any help is greatly appreciated, thank you.