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COMP Cams Pro Magnum hydraulic flat tappet lifters are engineered for Oldsmobile V8 260–455 and Pontiac V8 326–455 applications and require an adjustable valve train. These lifters are designed to resist pumping up at higher RPM, yielding a measurable power increase over standard hydraulic lifters. Specifications include .842 in diameter, 96 g weight and 2.01 in seat height; pre-load .002–.004 in with the engine warm.
COMP Cams Pro-Mag Lifters Olds260-455/P
