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86TOYO2k17: you probably meant - undersized? Oversized needs to be the pulley that turns other things, in this case - only crank pulley. Rest need to be same or undersized, to be driven at less rpms per same engine/crankshaft pulley rpms. AC, alternator pulley - "accessory pulleys" that are being turned, not doing turning, to free up engine energy used for that.
Though pulleys that don't spin anything but spin freely and are there only to tension belt, may aswell be oversized. But there is close to no gains to that, rather slight weight gains.
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