Forged from 8620 steel, heat-treated then shot-peened for additional strength and durability3/4'' long bushings instead of 1/2'' long bushings found on most other rocker armsFeatures a modified lubrication system with unrestricted roller oilingSet includes two each front and rear rocker armsMade in the USAMust be used with adjustable pushrods (sold seperately).Recommended that new rocker shafts be used when installing roller rocker arms (sold seperately).