an underdrive pulley will work on any engine. it doesn't really "create" horsepower so to speak, it just frees up more of the power the engine is already producing. i put a 2 piece pulley set on my jimmy and noticed a little difference without any of the charging problems you are talking about. all in all i was pretty happy with it.
and it doesn't have anything to do with the mass/resistance of the pulley. it's the simple fact that the smaller pulley will spin at a different speed than the larger pulley. same idea as swapping a s/c pulley.
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