Editing Cylinder head (section)

{{short description|Component of an internal combustion engine}}
{{multiple image
 | align      = right
 | direction  = vertical
 | width      = 300
 | image1     = K20 head.jpg
 | caption1   = Side view of a [[Dual overhead camshaft|DOHC]] cylinder head (with the valves and camshafts installed)
 | image2     = Cylinderhead.JPG
 | caption2   = Underside of a [[Overhead valve engine|OHV]] cylinder head (with the valves installed)
}}

In a [[Reciprocating engine|piston engine]], the '''cylinder head''' sits above the [[cylinder (engine)|cylinders]],<ref name="Wright 2015 p. 310">{{cite book | last=Wright | first=G. | title=Fundamentals of Medium/Heavy Duty Diesel Engines | publisher=Jones & Bartlett Learning | year=2015 | isbn=978-1-284-06705-7 | url=https://books.google.com/books?id=s5_OCwAAQBAJ&pg=PA310 | access-date=2020-11-07 | page=310}}</ref> forming the roof of the [[combustion chamber]]. In [[sidevalve engine]]s the head is a simple plate of metal containing the [[spark plug]]s and possibly [[Air-cooled engine|heat dissipation fins]]. In more modern [[overhead valve engine|overhead valve]] and [[overhead camshaft engine|overhead camshaft]] engines, the head is a more complicated metal block that also contains the inlet and exhaust passages, and often [[Radiator (engine cooling)|coolant passages]], [[Valvetrain]] components, and  [[Fuel_injection#Direct injection systems|fuel injectors]].