just recently put a rebuilt 5mil crank in my buddys banshee, has the wiseco pistons with the different wrist pin location, so as far as I know I do not need a spacer for the jugs, the stock cast head is machined out, I am guessing for a different cumbustion chamber volume. my real question is do I need a different thickness head gasket? I put a stock one in it and it weeps just a little, I did the math and I dont see a issue with interference, and I ran it and it seems ok. or does someone have a sealing trick I need to know about. I also checked the head with a straight edge and it seems to be within .003. thanks for input