Our build up had basically just polished heads, a flat tappet cam, crosswind intake and a 650 demon carb. I wasn't too happy with the numbers, it was a 11+ CR engine run on pump gas and made 468 hp at 6000 rpm and 490 ft-lb of tq. I think there was something wrong with the combo, other carb, intake and headers, and I believe it would have made 500 hp.