Most '80-and-earlier 2.5L engines use the same 3/8-24x7/16-2O "bottleneck" positive-stop rocker arm studs as Pontiac V8s of the same era. An inexpensive adjustable valvetrain conversion that retains ...

It's no big revelation that high-lift rocker arms (those with a greater multiplication ratio than stock rocker arms) generally increase the performance of an engine without necessitating a camshaft ...