even though the motor was rebuilt a 1000 miles ago ,im going to take it apart and do a piston swap. im going to usesilvolite pistons prt no. h3418 std.with 76cc heads i should produce 9.1:1 compressiion,voodoo 60303 cam lifters and springs , the heads have 194" int and 1.5" exa. screw in studs i think this should work well