General Motors sees a future for engines with overhead valves, a technology most automakers have abandoned in favor of overhead camshafts. GM will introduce a new family of overhead-valve (OHV) V-6s ...

Contemplating the advantages of the pushrod-actuated overhead valve engine design in what appears to be the twilight of internal combustion might sound as anachronistic as a quick look at the value of ...

General Motors Corp. sees a future for engines with overhead valves, a technology most automakers have abandoned in favor of overhead camshafts. GM will introduce a family of overhead-valve V-6 ...

Rare Ardun-equipped Ford flathead V8 crate engine built by Irvin Werksman is offered for sale with period-correct performance ...

Adjusting overhead valves on heavy-duty ­diesels is a routine maintenance item subject to benign neglect in many of today’s fleets. The hardware that links the camshaft to the valves and some ...

Combustion engine valvetrains have evolved over time. While flathead and overhead valve designs were more popular in the past, most modern engines run overhead cam designs. Three common combustion ...

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 ...

Electric cars are all the rage lately, but let’s not forget about the old standby – internal combustion. The modern internal combustion engine is a marvel of engineering. Today’s engines and ...

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 ...