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The cylinder head is one of the most important parts of an engine. It houses the valves that control the flow of air and fuel into the cylinders, and the combustion chamber where the fuel is burned. The cylinder head also contains the spark plugs that ignite the fuel.
A cylinder head can be made from a variety of materials, but most are made from cast iron or aluminum. The choice of material depends on the application and the desired properties of the cylinder head. For example, cast iron is strong and durable, but it is also heavy. Aluminum is much lighter, but it is not as strong.