No, I have stock heads that I "home ported" in my garage, so I don't know how the results from that will be. I don't think it clears by very much, Jason said I would have to stay with stock valve sizes or flycut. The cam is ground by PRC. I'll post the dyno runs, I can host them myself. Seat of the pants feel over the TR224 is quite dramatic; pulls harder from 3000 rpm up and revs much quicker in the high rpms. I had to get a shift light, as my stock tach is now useless with this cam. My clutch says it pulls harder too, I'm going to have to replace it soon. I would have gotten the Magic stick, but I thought it had slightly too much lift for my Comp 918 springs. Now I'm not so sure . . .