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 ...

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

General Motors has filed a new patent that offers a look at how the company may be rethinking cylinder deactivation for its next generation of pushrod engines.

If the LS1/LS2/LS6 engine family has a shortcoming, it has to be the rocker arm mounting, which doesn't allow for adjustment. Non-adjustable rockers have become standard in virtually all late-model ...

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 ...

A recently filed patent details a new GM cylinder deactivation system that appears to be heading to the next-gen V8 engines ...

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 ...