In racing, the valvetrain is one of the most highly stressed engine systems. High valve lift, high engine speed, and high spring pressures exponentially increase their demands on the lifters, pushrods ...

There are many styles of overhead-valve rocker arms: shaft-mount, pedestal-mount, and stud-mount. Sometimes the aftermarket will take an engine that came stock with a pedestal (like a 5.0L pushrod ...

An engine that just doesn't perform as it should at high speed on the dyno or racetrack can induce a series of checks that usually first includes measuring the pressure and volume of the fuel being ...

Shaft-mounted rocker arms are usually reserved for the high-stress environment of an all-out racing engine-whether it's for drag racing or some other competitive motorsport. Most of us late-model ...

GM has filed a patent application a variable displacement valvetrain system with rocker shaft porting and insert sleeves for engine cylinder deactivation. The patent application is tagged with patent ...

Honda reports that some 2008-11 Accords, 2008-12 Odyssey minivans, 2009-12 Pilot SUVs and 2010-11 Accord Crosstour models with V6 engines may produce a knocking or ticking sound at idle.