Yes, Blazin' Bob has the answer. Don't worry about it. The ridge is probably carbon and can come off with a pocket knife.

It's a cheap block and not worth sonic checking. I'd sleeve it first if 0you must, leave it at 40 over.
BTW, a '9 360 block is NOT a 5.9 Mag block.

R.

Last edited by dogdays; 01/09/17 12:36 AM.