Thanks for the detailed information. Cam timing may be my problem. I did degree the cam when I installed it, however, at the time I did not know that Comp grinds them with 4* advance already. I put 3-4* advance in it when I installed it. So it must theoretically be at about 7-8* total. How much cam timing is excessive, where do you draw the line? It sounds like I may have a real issue if the cam wants timing farther in but the piston timing doesn't. I don't know if it would be safe to run it hard like that... which means I need to figure out the quickest and easiest way to get that cam back in place.