Originally Posted by 454navyss

that does help. are these the heads you are talking about? and what is the combustion chamber size on them? all i see is "Smaller Combustion Chambers For 10.75:1 Compression"

http://www.texas-speed.com/shop/item.asp?itemid=84

i have no problem running 93 since i already do all of the time (because of timing in the tune)