Comp Cams Hydraulic Roller Lifters are an upgrade for factory lifters in the Series II 3800. They increase high rpm performance and keep your valve train safe when spinning to higher rpms.

 

OE lifters are a performance replacement for stock hydraulic roller lifters. Preload is meant to be setup similar to stock.

 

OE-R lifters are specifically designed to perform at higher engine speeds. When engines are equipped with a hydraulic camshaft, 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. These lifters are almost required for any 3800 car shifting above 6000rpm because they help with the typical 5600rpm dip.  OE-R lifters are preloaded and have to be installed between 1/4 and 3/4 turn (vs. 1/2 to 1.5 turns on stock lifters)