Anyone changed them if so what brand (heads and cam) and cam size. How much more hps. Thanks

 

father has 03 ss we replaced the cam, it was similar to the comp cam 54-412-11 grind# XR265HR14, however it has a procharger P1SC with 11 psi, here is the specs 213/218 .529/.536 114.0 lsa. It is hard to judge the performance gains based on the fact no one has an awd dyno around here. I can tell you our first time at the track it ran a 13.20 @ 98 mp with a 1.70 60ft at 93 degrees, we had a problem with it going into lockup in 3rd & bogging down half way down the track. LS1 Edit fixed that though, seat of the pants the cam REALLY complimented the supercharger. Richard 99silveradoss has the video if curious....