Has anyone used these new style Comp Cams Pro Magnum Rockers on a big block chrysler with stock style heads such as 906 or Edelbrock RPM?

Any experience with these rockers would great.

http://www.compcams.com/ultrapromagnum/

http://www.compperformancegroupstores.co...;Category_Code=

http://www.summitracing.com/parts/CCA-1621-16/

I thought the ultra pro had bushings?




The new COMP Cams® Ultra Pro Magnum™ Chrysler Shaft Mount Rocker Arms feature all of the same high performance qualities as our stud mount Ultra Pro Magnum™ Rocker Arms plus all of the benefits of a shaft rocker system.• Engineered SAE 8620 chromemoly steel body is heat-treated for maximum strength



• Contain proprietary bushing inserts



• Unique oil system lubricates all critical parts for long lasting service



• Designed to handle roller lobes and higher spring rates

from what I understand Comp is dropping the Pro Magnum & will only be selling the Ultra Pro. I have just fitted a cuple sets on eddies'
Pro Mag rocker has a narrow rolled teflon coated bushing.