I blew the stock motor and am doing my rebuild now. I mostly do trail and motocross so I'm thinking a trail /woods port. 65mm bore ,Wiesco pistons ,true and weld my crank,cool head and domes, port my cases. ......I run stock cards,pods,vforce4s and t5s......what are your thoughts on this set up? Where should this put me in hp and would a 4mil crack be better bTnx in advance for any input fellas.