Big-O

iTrader: (3)

took my z-28 to a shop in mexico (it broke down down there) and the dumb *** didnt tightent the bolt properly and now my harmonic balancer fell off and i have no idea what size bolt to get .. need help thanks Juan..

shbox

7/16"-20 x 2¼" at least grade 8 and used with a thick washer.

James Montigny

iTrader: (13)

Most autoparts stores will have a nice grade 8 or black oxide bolt marked "SBC crank bolt", comes with the thick washer.
It will match the specs Shbox provided.

I hope it didn't damage anything when it came off.
I had that happen a dyno once because someone did the same thing to me.

robsquikz28

iTrader: (246)

I have a stock one if you need it....$18 shipped to ya lmk