These are some rollers I bought used and ran in one of my 440's a few years back. Trying to id the manufacturer here. These are good quality tappets, fully rebuildable, as the snap rings holding the axles in indicate. I think they are Crane, but not certain. Anybody certain? Is Chase in the house? I dont think they are Comp Cams, the rivets holding the link bars on look different, and I dont think they are Isky, I think the link bars on Isky Mopar tappets are open ended.