What would cause the cam to break on the outside of the cap? (No damage to the head). Fatigue or maybe the belt tenisioners seizing. The F22a6 has about 300 g's on it. Also if I use a cam from a A1 or A4 will the valve lash set the same? I know I will lose HP if I use one of these cams but I can't find an A6 cam. The bottom end turns freely so it is not locked up. Thanks for the help.