COMP Cams Lifters 862-12 COMP Cams Pro Magnum Hydraulic Lifters are specifically designed to perform at higher engine speeds. When engines are equipped with conventional Hydraulic lifters, high RPM is limited by improper positioning of the internal piston. Pro Magnum Lifters eliminate improper positioning and harmful ?pumping up.? COMP Cams Pro Magnum Hydraulic Lifters offer a significant power increase over standard high performance Hydraulic lifters, especially in race applications where a Hydraulic lifter must be used. An adjustable valve train is required to use Pro Magnum Hydraulic Lifters. Pro Magnum Hydraulic Flat Lifter for Ford 231/240-300 6 Cylinder. COMP Cams Pro Magnum Hydraulic Lifters for 289-302 Small Block, 351 Windsor, Cleveland, and 429 460 Ford, Set of 12 COMP Cams Pro-Magnum Hydraulc Lifters Fo

Vehicle Fitments: