These heads kick butt from Ford i am using them on my 347 strocker zheads, zcam, gt40 intake, and this thing got the power . I would say with my 11:0:1 compression ratio i have about 460hp plus and over 400lbs of torque at the flywheel hmm what sti or evo opps bye bye supra I would say the car is in the 11's My ride wieghs in at 2900lbs . I did however hear that the valve guides were on these heads without using shaft rockers according to the guy at panhandle performance . I say go for them they beat most heads flow numbers go to the ford racing website they flow 277cfm intake at .550 and 218 exhaust beats afr tfs etc see and compare at http://www.allfordmustangs.com/Detailed/630.shtml my cars done just need to dyno it .. got mine from summitt
Cool, glad to hear you like them... Did you do anything to them or just bolt them on?? Also what other components did you need to get, Part numbers would be nice?? And of course how was the P to V clearence. Do you think that these heads would work ok with my set-up, gt-40 302 crate motor, and soon to be mounted Procharger P1SC??? I currently am running GT40X heads.