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 ...

Overhead-valve internal-combustion engines, in which the valves are located in the cylinder head and actuated by a block-mounted camshaft via pushrods, go way back in automotive history. Production ...

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 ...

Time was when a valve job was done with some valve-grinding compound and a vacuum cup on a stick. But no more. Today's high performance engines require the same machining precision in the valves that ...

The V-twin is a core element of the Harley-Davidson story. Here's the history behind Harley's most important V-twin engines ...