Short Travel Link Bar Retro-Fit Hydraulic Roller Lifters. When dealing with full travel lifters certain engines respond better to a light pre-load because it recovers more quickly from any bad harmonics in the valve train. Others work better with a heavy pre-load because oil volume is reduced under the plunger which increases stiffness. COMP Cams Short Travel Hydraulic Roller Lifters allow you to have the advantages of both light pre-load and reduced oil volume producing the most stable and highest revving hydraulic lifter available. Applications: CHEVY Small Block. Works with ALL Small Block Chevy Engine Blocks; '55-'86 Flat Tappet '87+ OE Hydraulic Roller Aftermarket. Specifications: Includes (16) .842" Diameter 152g Weight 2.66" Seat Height. Except GM LS / GM Gen III/IV Small Block V8 (LS1 LS2 etc).