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Well even with a cross plane V8, it's not like the crankshaft is going to fatigue and snap with a little less damping mass. Some light misfiring probably puts more stress on the crank than that. If you remove some of the mass from the middle of the pulley, that also reduces the inertia at the front of the crank and will increase how much energy is transferred to the damper.
Do people running aluminum aftermarket crank pulleys see increased belt wear? If they don't, then I feel pretty good about machining down a pulley to underdrive accessories.
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