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Cylinder head
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=== Sidevalve engines === In a [[flathead engine|flathead]] (''sidevalve'') engine, all of the [[valvetrain]] components are [[cam-in-block|contained within the block]], therefore the head is usually a simple plate of metal bolted to the top of the [[engine block]]. Sidevalve engines were once universal but are now largely obsolete in automobiles, found almost exclusively in small engines such as lawnmowers, weed trimmers and chainsaws.
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