LOL! I'm not that serious about it. I look at Dom's and Andy's 470's and they made or make what seems to be easy power and it doesn't require anything real expensive as far as heads and rockers. My rockers alone cost me $1150 and there not T&D or Jesel. Second thought, maybe my combo would have made 700+hp with RPM heads and a much smaller intake. The big stroker motors need a lot of cylinder head from what I have seen. My next combo will be a 470 with a very good cylinder head expensive or not. I still think its a better machine. Heading to Detroit now. Back later.