Pro Magnum Hydraulic Roller Lifters Suit GMLS, Small Block Chevy with OEMHydraulic Roller Cam

Pro Magnum Hydraulic Roller Lifters are specifically designed to perform at higher engine speeds. When engines are equipped with a hydraulic lifter, 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.