Well, I hit 419 at PAS with those heads/cam fast 90 intake/tb but didnt know the heads were still at 66cc (AFR never milled them like there were suppose to) . Since then Ive milled the heads to 62cc, used thinner head gaskets and put an UD pulley... Steve installed a speed density tune on it, so I dont know where im at right now as far as HP but oh well.