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A shaft in an ICE that actuates components that open valves into the combustion chamber to allow the flow of necessary gasses in order for a combustion process to function.

The image below depicts an exhaust and an intake camshaft for a DOHC ICE

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In the image below that camshafts can be see at the top of the engine.

This image is of a 4 cycle DOHC (Dual Overhead Cam) design.

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An Image of a cam lobe, a component of the camshaft

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