Okay I have a 2004 blaster motor runs okay but needs oil seals. I am going to buy a full gasket and oil seal kit to fix it but I was wondering if It would be best to get my head shaved andporting done or get a 3 mil crank can't really decide between then I already have a fmf gold seris fatty with a power core 2 and a little porting done by a friend also am running a 66.5 mm piston also are ther any other parts I would have to use to have thes mods