I'm refreshing a 454 that I swapped over and I have a question about the valvetrain. The engine came to me with full roller rockers, guideplates, and some seriously messed up pushrods. I ordered new pushrods from Summit, but I got 3/8 (really the only size I could find for a big block) and the guideplates are 5/16. I took the guideplates off, but the tip of the rocker seems to slip off of the valve tip pretty easily. Are guideplates required for full roller rockers to keep this from happening? I haven't tightened the valves yet to see if they stay on better, but I don't want to have to adjust the valves twice.