The cylinder head is located above the cylinders on top of the cylinder block of an internal combustion engine. The combustion chamber is formed when it shuts in the top of the cylinder. A head gasket keeps this junction sealed. The channels that feed air and fuel to the cylinder, as well as those that enable exhaust to exit, are located in the head of most engines. The valves, spark plugs, and fuel injectors can all be mounted in the engine's head.