"R" Series Hydraulic Roller Lifters
Comp's Pro Magnum hydraulic roller lifters are specifically designed to perform at higher engine speeds. Since this 496ci is equipped with a hydraulic roller camshaft, high rpm is limited by the improper positioning of the internal piston, as the lifter inevitably "pumps up." The improper location may result in broken valves or in our case, valve float and ultimately a loss of power. The "R" series lifters offer a distinct advantage over standard hydraulic lifters because they offer tighter tolerances and a stiffer internal spring.