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Nope, I was referring to machining the OEM crank pulley for a smaller diameter. The groove angles need to be machined correctly for belt life. It shouldn't be overdone, I would go only 10% on the crank pulley (maybe less, if there's not enough material), because the alternator in particular is not supposed to be run that much slower.
Mass needs to be added back to the harmonic damper to make it work correctly. Usually, the pulley is the harmonic damper mass, but some crank pulleys have a separate harmonic damper, in which case life is easy and you can just cut away.
I would personally not mess with the harmonic damper's rotational inertia unless the crank has been modified. The OEM did their homework on crank harmonics.
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