This is a category that is pretty rapidly going away. You'll be hard-pressed to find an overhead valve — also known as a pushrod — engine in anything outside of a General Motors LS/LT V8 or one of ...

Pushrod V-Twins had a very unique design that involved the use of four camshafts connected by meshed gears. The reason for ...

General Motors’ all-new 3.9L V6 has been honored with a Breakthrough Technology award by Popular Mechanics for its innovative use of variable valve timing in an overhead valve engine. For ages GM has ...

It seems, for the modern American production car. that the 'L' head engine is a thing of the past. Present design trends indicate that the few remaining flathead engines now in production will be ...

The Cadillac 4.2L Twin-Turbo V-8 LTA engine is a clean-sheet design. It was developed as a small-displacement V-8 with the goal of delivering exceptional power density of 131 hp (98 kW) per liter, for ...

In racing, the valvetrain is one of the most highly stressed engine systems. High valve lift, high engine speed, and high spring pressures exponentially increase their demands on the lifters, pushrods ...