The new COMP Cams® Ultra Pro MagnumTM Chrysler Shaft Mount Rocker Arms feature all of the same high performance qualities as our stud mount Ultra Pro MagnumTM Rocker Arms plus all of the benefits of a shaft rocker system.o Engineered SAE 8620 chromemoly steel body is heat-treated for maximum strength
o Contain proprietary bushing inserts
o Unique oil system lubricates all critical parts for long lasting service
o Designed to handle roller lobes and higher spring rates |