Originally Posted by Lost in the 60's
Check for clearance between the cam gear and block. If you can't push it against the block, you may have found what caused the gear to move forward and the chain to rub. That plug should just be a hair in from flush and may be a shallower plug than a frost plug. It isn't there for frost, it's just to fill the came bore hole.
As a second condition to check, see if the cam lobes are centered in the lifter bores. If they are slightly forward too, you know what to do...
I pulled the cam gear and from what I can tell the cam gear is riding on the block like it's supposed to do. But I did find that there is about 1/4" + deflection in the timing chain. So, I'm looking to replace the timing chain and gears. I'm not use to seeing so much deflection, this may fix my issue.