I went to long slot rocker arms on my vortec 350 because I was told with a near .500 lift cam the small slot rockers will bind in the rocker ball area and it did break 2 rocker studs. I replaced all studs with ARP screw in studs and bought roller tip long slot rockers with poly locks . Everything things seems ok now. So as I was cleaning up my work bench I got an old regular small block rocker off my old 350 (that I converted to roller rockers) and compared the rocker slot with the self aligning rocker slot. The picture shows the difference. In my opinion do not use the self aligning rockers with a high lift cam. You will be asking for trouble down the road. And by the way I changed the valve springs to handle the nearly .500 lift. I'm running the Chevy "HOT cam.