the one guy i talked to had these heads on his 2004 GTO… 224/224 cam FAST 90 full exhaust etc and claims he went from 358rwhp - 406rhp with just the head swap.
the one guy i talked to had these heads on his 2004 GTO… 224/224 cam FAST 90 full exhaust etc and claims he went from 358rwhp - 406rhp with just the head swap.