COMP Cams 875-4 Hy-Rev Lifters for Buell Twin Cam/Sportster

Hy-Rev Lifters for Buell, Twin Cam and Sportster. Hy-Rev? Hydraulic Lifter: All of the lifters components are produced on state-of-the-art computer controlled machinery which holds the O.D. size, straightness and roundness tolerances to .0003in., for the precise fit demanded of today's high performance engines. Proudly made in the United States, each lifter must pass a stringent quality control test to ensure proper manufacture and function.