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What is a valve in a car?

There are a variety of valves on your car (usually referred to as a "car valve" or "car valves"). The intake valve allows the fuel-air mixture into the combustion chamber of the engine, while the exhaust valve releases the burnt fuel-air mixture into the exhaust system. When valves wear out or fail, the cylinder head must be removed and taken apart. This is a fairly involved process that requires resurfacing, pressure testing, and precision work.