Editing Jaguar XK engine (section)

{{Use dmy dates|date=November 2017}}
{{Use British English|date=November 2017}}
{{about|the straight-six engine produced by Jaguar Cars from 1948-1992|the sports car introduced in 1948 powered by this engine|Jaguar XK120|the later XK140|Jaguar XK140|the XK150|Jaguar XK150|the grand touring cars produced by Jaguar from 1996–2014|Jaguar XK}}
{{Infobox automobile engine
|name=Jaguar XK
|image= Jaguar Heritage Racing (7005536288).jpg
|manufacturer=[[Jaguar Cars]]
|production=1949&ndash;1992
|successor=[[Jaguar AJ6 engine|Jaguar AJ6]]
}}

[[File:1955 Jaguar XKD engine.jpg|right|thumb|250px|Jaguar XK engine in a 1955 [[Jaguar D-Type]]]]
[[File:SC06 Jaguar XK150 engine.jpg|right|thumb|250px|XK engine in an [[Jaguar XK150|XK150]]]]
[[File:Jaguar XK6 engine 1.jpg|right|thumb|250px|Jaguar XK engine in a [[Jaguar E-Type]]]]
[[File:Jaguar 420 engine bay.jpg|right|thumb|250px|4.2-litre XK in a [[Jaguar 420]]]]

The '''Jaguar XK''' is an [[Straight-six engine|inline 6-cylinder]] [[dual overhead camshaft]] (DOHC) engine produced by [[Jaguar Cars]] between 1949 and 1992. Introduced as a 3.4-litre, it earned fame on both the road and track, being produced in five  [[hemispherical combustion chamber|hemispherical head]] displacements between 2.4 and 4.2-litres for Jaguar passenger cars, with other sizes being made by Jaguar and privateers for racing. A [[Engine tuning|de-rated]] version was also used in certain military vehicles built by [[Alvis Car and Engineering Company|Alvis]] and [[Daimler Company|Daimler]].