I bought a used rear LS1 disc setup to swap onto my Chevelle but the calipers are red and have PBR on them.

Finding some conflicting results as the whether these are stock or something else?

One has a damaged dust boot so I ordered Fenco rebuilts from Advance Auto for $30 each (after coupon) and was going to use these for cores...unless they are something I should be rebuilding instead of replacing.

 

LS1 Fbody or C5 Z calipers?

They were both made by PBR as far as I recall, but OEM Fbody calipers should have been natural metal whereas C5 Z06 calipers were red. Besides the Fbody ones being gravity cast, versus pressure cast for the C5's, there isn't much difference in physical size. They are nearly functionally identical.

 

They look painted. Just wanted to confirm they were factory and not aftermarket.

Thanks for your help!

I've half *** test fit my wheels on a friends 69 with ls1 swap rear discs, hope I don't get any surprises when I torque them down. Be nice to get rid of the damn drums.