Last month's "How It Works" story gave you the basics of the four-stroke cycle, describing the motion of the intake and exhaust valves in relation to the piston moving up and down in the cylinder.

Overhead cams will replace the venerable pushrod configuration at General Motors early in the 21st century. Trucks and performance cars will get a choice of SOHC and DOHC setups. This does not mean, ...

The delicate relationship between the tappet and pushrod in a V-8 engine has not advanced far in our lifetime. While other cam technologies have taken the spotlight when it comes to making the power, ...

DETROIT - General Motors will produce a 7.5-liter V-12 engine to be used in future Cadillacs and will launch a family of overhead-cam, high output V-6 engines. GM also is revamping its pushrod V-6 ...

General Motors plans to use the largest displacement engines possible to cope with the increasing weight of vehicles and consumers' thirst for more performance. But more cubic inches under the hood ...