when i was buying my heads yesterday i was given two different prices, the OEM head was like double the price of the Ford Racing PI head, but i was told they are basically the same head. seems funny that there was such a drastic cost difference, btw part of the increased cost was a core charge when buying OEM heads. i kept saying, so they are the same head but you cant call a PI head OEM ? and they would say..."well, yeah they are the same...um..."they didnt really have a good answer.