"Sasquatch" AKA Todd Marsh--Marsh Performance has a fantastic Nascar porter near by--He has done LOTS of Indy heads and can out do the CNC ones by a mile. He dislikes the 572 heads but has been able to "improve" them enough so that Todd is making 1000HP anytime a customer has the $$ to build one. Makes me wonder though--why kill yourself( and your wallet) to build that for a BRACKET car. Dash ones, easy on parts old style roller, 800 HP and race it until you retire.