Does your engine need a valve adjustment? It depends on the age, condition and brand of vehicle you’re driving. Due to the popularization of roller-follower valve train designs that reduce friction ...

A small gap with big importance in the performance and health of an engine - here's everything you need to know.

Give them the results of a TDC valve-drop static clearance test, and Comp Cam's techs can calculate the piston-to-valve clearance for any of its cams at any degree of rotation. This is especially ...

Lots of displacement, more compression, and a ton of valve lift used to be the recipe for a typical professional-level drag-race motor. Today, this same description could just as easily be a serious ...

With the introduction of the new 5.0L, Four-Valve Coyote motor, the original Two-Valve has taken yet another step back in terms of popularity. The Three- and Four-Valve variants get all the publicity ...

Why is it that the Three-Valve, Four-Valve, and (especially) Shelby GT500s get all the modular love, when the Two-Valve motors are arguably the workhorse of the family? I know-the Four-Valve motors ...