Looking for feedback on the Ultra pro magnum rockers. They are bushed, and have adjusters that use ball-end pushrods.

I think I read on here(?) that they will handle high spring pressures (I seem to remember 600 open).

They are basically the same price as Harland Sharp rockers, which I already know have very good feedback.

I'm going to be using them on a 493 with edelbrock RPM heads, solid flat tappet cam. I may upgrade to a solid roller in the future, and would want to make sure these Ultra pro rockers would handle those sorts of spring pressures...

any thoughts? again, these are the bushed ones.. the ones they sold a few years back weren't bushed and i heard of galling with high spring pressures. thanks.