COMP Cams 863-1 - Pro-Magnum Lifter, Oldsmobile/ Pontiac

COMP Cams Pro Magnum Hydraulic Lifter for Oldsmobile V8 and Pontiac V8, Single Piece 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. .842? diameter; 96g weight; 2.01? seat height; Specifically designed to perform at higher engine speeds with significant power increase over standard Hydraulic lifters; Proper position of internal piston at higher rpm prevents lifters form harmful "pumping up"; Adjustable valve train required; Pre-load lifters .002"-.004" with engine warm