I am about to install a disc conversion with the GM single piston calipers, and keeping the rear drums (for now). Anyone know the bleeder thread size for the calipers, and for the the rear, which is a '69 10 bolt? Thanks.

Dave

I believe it's 5/16 on the rears, and 3/8 on the calipers. I know that the caliper bleeders can be either standard or metric (my kit came with metric) so your best bet is probably to take the cylinders and the calipers to the store and try them out.

3/8 16 tpi for the fronts.....