Did your machinist say what was wrong with the springs, retainers, or valves? The retainers were comp stuff for a long time, thats what came on mine, although I did switch them out for 10 degree stuff because I had the retainers. The springs that came on mine I’m 99% sure are Comp 911s.

My OOTB stealths made 479 RWHP and 492 RWTQ on pump gas, pretty good for a $1000 set of heads I thought.

Last edited by GTX MATT; 12/27/20 01:58 AM.
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street