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Retro-Fit Hydraulic Roller Lifter Pair for Ford 289-351W Pro Magnum Hydraulic Roller Lifters Ford Small block 221-351W. A retro-fit lifter for early model blocks equipped with a standard hydraulic cam. COMP Cams Pro Magnum Hydraulic Roller Lifters are specifically designed to perform at higher engine speeds. When engines are equipped with a hydraulic Camshaft high rpm is limited by the improper position of the internal piston as the lifter inevitably "pumps up". This improper location results in open valves and therefore leads to lost power or sometimes even engine failure. Available in a set of 16 under 8931-16