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

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 ...

Correct valvetrain geometry is critical to ensure trouble-free operation of an engine, especially during high-rpm operation. When building a new engine, many people simply reuse the original pushrods ...

If you own a 1968-'93 carbureted or EFI Ford 5.0L and want 17 more horses, here's the ticket for a lazy Saturday afternoon. It's an easy, low-cost modification that really works and does not hurt ...

The horsepower game is all about escalation. Everyone knows that the LS engines are the easiest path to big horsepower. But that also means bigger cams and higher engine speeds, and all that puts a ...