H-Beam Rods

Do not know how old. They do have ARP 7/16 12 point bolts. 6123 length, big end of the rod is .925. They look like they are new except for very mild surface rust. They were in an engine at least once, they had pistons attached. I planned on glass beading them for clean up. I will go back to where I found them and see if I can get more info.
Thank you