Anyone know what size bolts hold the pulley on to the water pump snout on a sbc? I think its a 1/4 fine thread but not sure of the thread spacing. I cant find the bolts I had.

5/16 fine
usually it's a stud that is 5/16 coarse on one end and 5/16 fine on the other, on older stuff anyways. Seems like the nuts are the coarse thread end of the deal, unless I have it backwards lmao. Snow on the ground and I'm not about to go outside and look at one.

Well, im using a Stewart water pump.

Thanks for the info though, I appreciate it.

5/16-24