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Cylinder Heads are an essential part of your engine. Simply referred to as heads, they serve as the housing for the largest number of moving parts in the engine. Sealed via the head gasket, the cylinder head sits on top of the cylinder block to create the combustion chamber. It houses the valves and spark plugs as well as ducts and passages to let the engine coolant to flow. The cylinder head withstands very high temperatures and pressures but because it sits static and is made of heavy iron or aluminum, the cylinder head rarely needs to be replaced.