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

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

Overhead cams are a more efficient method of actuating the valves than with a pushrod, but someone in Detroit never got the memo. And thank goodness they didn't. With production pushrod mills turning ...

There is no doubt that you can make huge power with pushrod 5.0L engines. Over the years, engine builders have figured out countless tricks for making horsepower. Even though some remain a secret, its ...

The rocker arm employs the use of a fulcrum or pivot to increase the cam lift by a given ratio. That increase in lift is the result of moving the pushrod pivot point closer to the fulcrum. That ...

LS engine architecture is indisputably amazing. There are examples everywhere, including the pages of Car Craft, of engines plucked out of salvage yards making reliable horsepower even at 1,000+ hp.