95stang50

now that im gettin my heads and cam finally done do i have to switch to 91 octane gas? and what kind of gain you think ill have over my pretty much stock setup am i lookin at alot of difference? do full roller rockers make alot of difference horsepower wise? what about high rev? whats the highest rpm a stock bottom end can handle?

Gary H

Octane will depend on the head CC and cam as well as timing. If the heads have the same CC chamber, then no you dont need 91 octane.

LTnone

You're holding yourself back until you get a better breathing intake on there. Then you'll really see the potential of the parts