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 ...

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 ...

When you're shopping for a mower, a number of considerations may go through your mind. Will it be easier to start than the last one? Will it last longer? To determine a mower's long-term odds, take a ...

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 ...

There is something highly rewarding about building an engine, in that many of them are logic machines: When assembled ...

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 ...

Add Yahoo as a preferred source to see more of our stories on Google. Camshafts are simple devices, but important ones. Modern engines can have one or more intake and exhaust valves, and it's the ...

At the end of the day, an internal combustion engine is just an air pump. Proper airflow in and out of the engine is thus ...

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 ...