The cylinder head is the metal
casing which covers the engine. It seals the main cylinders of the engine and
prevents oil and other substances from finding their way inside. It also
contains a number of valves vital to the engine. Internally the cylinder head
has passages called ports for the fuel / air mixture to travel to the inlet
valves from the intake manifold, for exhaust gases to travel from the exhaust
valves to the exhaust manifold and for antifreeze to cool the head and engine.

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