Forged from 8620 steel, heat-treated then shot-peened for additional strength and durabilityRocker arms have 3/4" long bushings instead of the 1/2" long bushings found on most other rocker armsFeature a modified lubrication system with unrestricted roller oilingMust be used with adjustable pushrods; sold separatelyFor ease of adjustment on 91-03 XL and Buell models, use pushrod tube covers DS-193829Recommended that new rocker shafts be used when installing roller rocker arms; available separatelyMade in the U.S.A.