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Cylinder head
Component of an internal combustion engine / From Wikipedia, the free encyclopedia
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In a piston engine, the cylinder head (aka "head") sits above the cylinders,[1] forming the roof of the combustion chamber. In sidevalve engines the head is a simple plate of metal containing the spark plugs and possibly heat dissipation fins. In more modern overhead valve and overhead camshaft engines, the head is a more complicated metal block that also contains the inlet and exhaust passages, and often coolant passages, Valvetrain components, and fuel injectors.