Small Block & Big Block Chevy Specific - Crank Balancer bolt size//???

I have a small block guessing its a mid 80s engine, what size bolt fits in the crank at the balancer end. I realize its a Wacke question but I can't find it on the web. Thanks :bang:

I have a small block guessing its a mid 80s engine, what size bolt fits in the crank at the balancer end. I realize its a Wacke question but I can't find it on the web. Thanks :bang:
I don't know the size, but if you go to checker or autozone or wherever they sell the bolt and nut in the aisle with all the SBC chrome stuff from spectre.

7/16 fine thread

Thanks alot for the info. :)