Even internally balanced engine gain a smoother run from a damped pully period. There have been internally balanced engines ship with just stamped steel pulleys in the past due for economics (cheaper) while the same exact engine put in luxury line would have a harmonic damper. Really unless your at the point of needing that last 1/8 of a hp you won't notice the gain of a lighter pulley however you may notice the harsher running. For the 99.9% of us I would say don't bother.
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