can someone please tell me what size the bolt is that goes into the crank to hold that damn harmonic balancer in place, not the length the thread size, and diameter

thanks i appreciate it

 

Any particular reason you aren't buying a replacement harmonic damper bolt instead of going to the hardware store?

 

im not goin to the hardware store either, i need to drill the damn bolt hole one size biggerso it can be retapped and i cant find the bolt

 

7/16 fine, forget the pitch

 

ede is correct (no surprize there). Lucky for you, Chevy used a 7/16-20 bolt in the crank snout. You can retap the hole to a standard 1/2-20 and install a 1/2-20 Grade 5 or better bolt (available at almost any good hardware store).

While you're at the hardware store, try to get a 5-6" length of threaded rod and a couple of mating nuts to pull the balancer back on. Don't use the bolt to pull the balancer hub back on, or you won't be so lucky next time.