I have a set of Dove rockers, who I understand makes the rockers for Comp Cams. They do not have a bushing, the aluminum rocker rides on the steel shaft, maybe they've changed? I also have a set of Harland Sharp, they do have a bushing. I use mine in a Drag Racing application and have never had an issue as far as the rocker & shaft, but I don't rack up any street miles.