Morning, all. I was just passing over this, and thought to go back and read lildebbie's first post about this problem, and saw something there that made me go "hmmm?". I'm gonna toss this out here and hope somebody will catch me if I am falling.

In the first post, lildebbie said that the problem started after the distributor was replaced. In chevy engines, there is something in my foggy memory about an oil pressure bypass groove in the distributor housing on some models, and not on others; something to do with early versus later designs, and that this groove has something to do with cam or lifter/pushrod/rockerarm oiling.

Is it possible that here was an incorrect distributor housing installed, and the oiling system was compromised, resulting in the cam failure?

Like I said, I'm just brain farting, here; I have been away from active engine building for a long time - twenty years, almost - and my memory is just --- dull.