I'm sure he's talking about all the work with his custom rocker/girdle set up and the hundreds of hours invested to get 250cfm @ .400" which is unheard of! If it were easy--everyone would be doing it. Instead all I see are 450-550hp strokers with a non-offset conventional cyl head. I've seen exactly 2 builds tagging the 600hp milestone--One was done by IQ52, the other was Mike @ B3. J.Rob