Race Hydraulic Flat Tappet Lifters< ul>< li> Tighter plunger-to-body tolerances and premium one-piece Pushrod seats< li> Super strict tolerances for the Mechanical internals optimize performance< li> Extra heavy-duty snap ring design increases lifter strength and durability< li> Pre-load can be set between .000"-.030" Applications: Ford Small and Big Block Specifications .875" Diameter - 122g Weight - 2.01" Seat Height.