Bronze gear against bronze bushing = wear. Same reason you don't use a steel gear with a steel roller cam ... similar metals !!
The bush in the block is not worn on the top where the bronze drive runs on it is worn inside where the oil pump drive runs, that is why I suspect dedris from the bronze drive failure got between the drive and the bush. The drive is marked up where it runs in the bush.
Correct me if I am wrong but dosnt the turning of the dizzy/oil pump drive force the cam to the back of the block, I thought this is what the torrington on the back of the timmig gear set was for?
