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 ...

Chevrolet's small-block V8 engine's simple, reliable design outperforms modern turbocharged rivals in terms of durability and ...

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 ...

Valves control how air and fuel get in and how exhaust gets out, and theoretically, more of them should translate to better airflow and more power. Before the 80s, two or three valves per cylinder was ...