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I recently retired from the Delphi plant in Grand Rapids, Michigan that makes the Cam Phasers. They were first used by GM on the dual overhead cam inline engines, like the L6 engine in the Trail Blazer/Envoy and the L5 engines used in the Colarado/Canyon P.U.'s. They've been using them since 2002 on the L6.
These actually mount on the exhaust cam and vary the timinig between the intake cam and the exhaust cam, optimizing torque, power and emmissions at any given RPM. Pretty slick! It allowed them to eleminate the EGR system.
I have not seen how they do it on a single cam motor, though.
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