
Cylinder head
Component of an internal combustion engine

Component of an internal combustion engine
In a piston engine, the cylinder head sits above the cylinders, 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.
Read on Wikipedia · Image Joe Flores, CC BY-SA 3.0
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