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by changing the effective length of the chain. by pushing the valve out, you effectively shorten the distance between cams. this is exactly why the dial indicators are so important, and why the variorum has to be pressurized to set the cam timing.
the slots we already have allow altering the position of one cam relative to the other, but not the cam relative to the crank, as the keyway is locked in position relative to the lobes, and the driven gear is a single piece. by having the ability to rotate one cam, relative to the lobes, or in this case, the chain gear, you can alter where one cam is relative to the crank. it's similar to just installing an offset woodruff key, like we used to do in the mobs
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