Let me tell you about my issues with the Pro Magnum rockers.
I had them on my small block with a .670 lift solid roller cam and 260ish seat pressure. The rockers galled the shafts and from that I bent a few valves. The rockers suck and i'll never use them even on a street engine.
I know ya'll going to say that I should not have used them with my cam and springs, but Comp and Indy said I would be fine.
Now the engine is at RyanJ's shop and I cant wait to get it back!!!