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While the camshaft has a fixed profile, the opening duration of it varies with with how much lift is being determined by the valvetronic.
Think of it as a continuously variable rocker arm ratio. if you change rocker arms on a chevy V8, lift and duration increase, even though the cam profile stays exactly the same. When valvetronic changes the fulcrum point on the arm that functions as the rocker, it changes the lift and duration simultaneously.
So yes, actual valve opening duration does change with the valvetronic system, even though the actual cam spec is static.
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