1
Hey guys I am putting my dads old race sled back together for him as a surprise. It's a 583 with fast twin pipes, he has told me the only Modification he had done was shave the head and run a thicker base gasket to make the pipes work better and jetting. i am going to run a 78 mm wiseco piston and have the raves cut down to match my question is how do I determine how much the head was shaved and what base gasket to run I can't see any markings on it