I took my stock cam out and there was literally a chunk missing from one of the lobes

wider then the lifter path Engine was bone stock untouched. Only time it was opened up was for the re-ring. i'll post pictures in a min. But the missing patch was n the front of the engine i thought at first it would explain scratches on the one clynder wall, but then i looked more closely and it would have had to be put into the car like that, i can't see the lifter doing that damage to it
