Thanks for the link johnny

yes it is rather amazing how exhuast and intake sizing and flow along with tunned ramming have an effect on an engines power curve let alone feel to the driver, Though I know can get non pi heads to make more power then pi heads

when you posted the flow numbers do those cylinder heads still have the stock valve angles?

aswell were the pi heads ported along with the non pi heads? what I mean is are the flow numbers the results after both heads have been ported?

say you wouldn't happen to know what the 3v cam lift is would yea?