Any gearhead worth his or her salt knows that whether it's a SOHC, DOHC, or OHV engine, the camshaft is considered the brain of a four-cycle internal combustion power plant. The camshaft's profile ...

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

The typical four-stroke engine is made up of hundreds of parts. These parts are all designed and engineered to work together to make a prescribed amount of power, torque, engine longevity, and other ...

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

The rocker arm is possibly the third most abused part in your engine. The connecting rods take the cake for the most abuse, followed closely by the piston assembly, but we like to think the rocker ...

This pump-gas, 470-inch big-block Mopar we recently started working on was originally built with factory-style, 1.50:1-ratio rocker arms. The 1.50 rocker arms were working just fine, but we decided a ...

In the valvetrain of your typical pushrod engine, the rocker arm is a critical component that also is an excellent tuning device. To properly tune with rocker arms, though, you need to understand how ...

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