The valve cover sits above the spark plugs. When the gasket fails and allows oil to leak onto the car’s spark plugs, fluid can get into the openings. As oil builds up, the spark plugs cannot work ...

Today's high performance engines require the same machining precision in the valves that is needed in the other highly stressed and accurately fitted parts. There are many causes for valve failure.

Signs That You Need Valve Clearance Adjustment As the valves are within your engine, all the symptoms will be connected with it. As such, you may experience the following: Cluttering noises. The ...

Some engines, however, take advantage of squeezing in a few more parts where they can. One area where this is seen often is in extra intake and exhaust valves.

Back-cutting valves is usually another low-lift flow gain method. If you have access to a valve seat re-facer, start with a 30-degree back-cut for Street Stock-type applications.

A simple slide valve is used, allowing steam to flow to one side of the piston and the other alternately, as driven by an arm coming off the flywheel attached to the engine’s output shaft.

As the engine heats up, the spring inside the thermostat expands and pulls the valve open. Electric chokes use the vehicle's 12-volt power to control the thermostat.

General Motors has issued a service update for 2021 model year full-size truck and SUV models that are being shipped to dealerships and may be affected by valve lifter problems. The problem ...