These tappets have undergone extensive development to increase load, lubrication, hydraulic and life capacities. Billet body. Increased roller width. Roller perpendicularity held to .0002". Hand-honed hydraulic unit cavity. Dynamic load capacities increased over 30%. Lubrication capacities for hydraulic unit and valve train (top end) increased 10%. Lubrication capacities for the roller, cams and cam bearings have increased 100% for increased cooling. Made in the U.S.A..
