V-Thunder™ Tappet Assembly - XL

Features an oil metering design that provides uniform metering throughout the entire rpm range. Rollers and axles are manufactured from high-carbon/chromium bearing-quality steel, which is through-hardened for improved wear and load-carrying capability, and the pushrod seat is carbo-nitrided. Each unit is 100% tested for proper function. HY-REV™ hydraulic roller lifter features internal hydraulic check valve, which allows for higher rpm. Made in the U.S.A.. PRO-MAGNUM™ hydraulic roller lifter requires adjustable pushrods..