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HYDRAULIC TAPPETS EVO/BIG TWINS - S&SRollers have a larger-than-stock inner bearing race that reduces stress and increases axle life Each lifter body and plunger assembly is hand-fit and pressure-tested to ensure correct operation Redesigned plunger assembly withstands forces associated with heavy-duty valve springs and pushrods typically used in high-performance applications Revised metering device precisely controls oil delivery to top end, ensuring rapid lifter pump-up and reducing possibility of oil starvation to bottom end Sold in set of four Made in the U.S.A.
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