S&amp,S Cycle Hydraulic Tappet Set 33-5352 Feature numerous significant design improvements Redesigned puunger assembly better withstans forces associated with heav-duty valve springs and cams typically used in high-performance applications Revised metering device precisely controls oil delivery to top end, insuring rapid lifter pump-up reducing possibility of oil starvation to bottom end Each lifter body and plunger assembly is hand-fit and then pressure-tested to insure correct operation Tappets also available with the HL2T Limited Travel Kit for improved cold starts and high RPM valve timing accuracy