Adjustable Cam Gears

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A generic picture of a HKS brand adjustable cam gear.

Adjustable cam gears are used to advance or retard timing on the intake or exhaust valves in order to increase performance. Much larger gains are to be had on engines that are running high boost pressure.

A generic picture of Fidanza brand adjustable cam gears.
Unorthodox Racing brand adjustable cam gears for the 3S.