After 2 years of severe testing in the LS market, we are releasing these in the 3800 market as our high performance lifter, superior to the common LS7 lifter that we also sell. We have had many customers tell us they work very well on stock engines, mildly modified engines, and most of all highly modified valve trains. Like with all valve train modifications different length push rods maybe needed. Measuring with a push rod length checker is always recommended. Externally they look just like an LS7 lifter.
This lifter is modeled after the Comp 875 lifter but it has more travel range for more installation flexibility. They give higher RPM power w/o the noise of other aftermarket lifters.
Below is a description between the differences of the standard Comp OE Lifter compared to the OE-R. This lifter is inbetween the two where you get the feel and sound of an OE lifter, but more of the performance of the OE-R lifter without the drawbacks of the OE-R. The OE lifter is slightly better than an OEM lifter.
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. LS7 lifters are preloaded and have to be installed between 3/8 and 3/4 turn (vs. 1/2 to 1.5 turns on stock lifters) It's recommended to use a pushrod length checker.
How to determine proper push rod length by measuring "lifter preload":
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