...= (lift) at any given pressure is determined by the kinetic energy of the hammer, which in turn is determined by the stroke and strength (stiffness + preload) of the spring. The mass of the hammer has nothing to do with it.
A light hammer is simply accelerated to a higher velocity, and so delivers the same energy to the valve stem as a heavy one, knocking it open just as far.
It's the duration (dwell time) of the valve that's affected by the momentum - and therefore the mass - of the hammer.
To get the same dwell with a lighter hammer would actually require a stronger spring and more lift.
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