talked with sal at ace perf. couple of years ago, he stated .025 shims would increase valve float 450-500 rpm on stk. springs. don't see that as option if you already increased lift also without cking coil bind. my son's 07 is on the dyno now, and we're running into the same thing, hitting rev limiter at 12500 with power still climbing, probably losing 3-5 hp if we could overrev. 08 race int. degreed at 110.5 stk. 07 ex. at 106.5, carp. springs and retainers. need to degree lower, or extend ecu. i believe your stretching it on float and ptv with your setup. my 04 has same situation with stk. shimmed springs on stk. lift web regrinds.
Last edited by gazx10; 06-12-2012 at 03:18 PM.