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It only changes overlap and not lift? Most power on a high lift cam is made from lift not overlap. Excessive overlap makes power to a point, but the effects are negated pretty quickly. I'm guessing when the cam shifts over it's also increasing lift which is really where th power comes from, keeping the valve open longer as well as farther. You can mimic overlap with adjustable cam gears and they make power to a point, but not like a bunch of lift does.
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