Just took apart my 427 too find out if I had a head gasket leak and sure enough I did. But that's not all I found. Time for new pistons a bore and rebuild haha. The mains and rod bearings were blue hot. Cranks still standard and it had standard bearings. What kind of clearances would be ideal for a lake boat. I ran 15/40 syn and I got a 10 quart pan no cooler 70psi of oil press and usually 220F of oil temp after a couple good passes. Also what can you tell me about my cam? It looks like a custom grind.