Guideplates required for full roller rockers?

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.

ALL BBC use guide plates size 5/16 .3/8.7/16 push rods in 3/8 is the size i use the most the only way you do not need a guide plates if you running a shaft rocker arms

Ok, thanks for the quick reply! Do you think I could just drill the 5/16 guideplates out to 3/8, or I would just be better off to not be so cheap and just buy some 3/8 guideplates?

In a word....BUYEM

Do it right, and you'll only have to do it once:D

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Originally Posted by perfecto

Ok, thanks for the quick reply! Do you think I could just drill the 5/16 guideplates out to 3/8, or I would just be better off to not be so cheap and just buy some 3/8 guideplates?

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no way are you going to drill them . there file hard no drill will go thru them but you will bust the fork part off the push rod rides in . the hole is not round but square so a drill will not work . so you can not open them up so buy some 3/8 plates . less you have more tools then a hand drill made to cut hard steel and the setup time it would take.it is way over the price of the ones made to work for 3/8 push rods

Awesome, thanks for the help guys. I'll order some new guideplates up right now!