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The cam-within-a-cam consists of a solid intake camshaft within a hollow exhaust camshaft. The solid shaft has holes for cylindrical pins, located at five points that align with axial slots in the hollow outer shaft.
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Camshaft-within-a-camshaft design (Mahle’s CamInCam)
 |  Dodge Viper engine (Gen IV) |
Assembled steel articulating camshaft to allow controlled phasing of the exhaust valve event.
