An engine valve is a very important part of your engine running. It is in the head which is just over the block and pistons. There are exhaust and intake valves. The camshaft operate the valves to go up at certain point to allow air and fuel in for intake and allow waste to get out through exhaust. they return down with a spring and seal up the combustion chamber give you the compression needed for the engine to run and the fuel to ignite and drive the pistons.
A multi-valve engine design typically has three, four, or five valves per cylinder to achieve improved performance. Any four-stroke internal combustion engine needs at least two valves per cylinder: one for intake of air and fuel, and another for exhaust of combustion gases.
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