redbird555

Got my stage 4 AHP heads installed this weekend, non ported, hollow ferrea valves pm guides and stock springs. Killed service has been awesome and he got me the heads quick, install was very straightforward and the valvetrain is noticeably whiter at hot idle now. Car is an 07 with 17k on it. Overall I'm very happy, motor pulls just as good as before and sounds even better.

sbrooks64

AHP does a great job. Were your valves out of spec?