Before the implementation of hydraulic lifters to keep the engine's valves in proper working order, regular adjustment was required to maintain the critically necessary clearance in the valvetrain.

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 Federal Aviation Administration is ordering General Electric Co. to repair 300 of its turbofan engines because bad valves have caused two engine fires without hurting anyone. The CF34-8C and ...