There’s a very distinct trickle-down system that flows from the racetrack directly to the street. Everything from intake manifolds to the latest exhaust header technology is fair game, and this ...

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

Jesel's New Sportman Series Shaft-Mount Roller Rockers Bring Bulletproof Racing Technology To The Bolt-On Street Car Ranks Shaft-mounted rocker arms are usually reserved for the high-stress ...

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