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The Mack Serpentine Belt drives several engine accessories through one ribbed belt instead of the separate V-belts used on older drive layouts. Molded ribs seat into matching pulley grooves across the accessory route. Installing the correct rib profile keeps each pulley engaged at the intended belt position during normal engine operation. The Mack 20870671 carries that matching profile for this pulley set, so the replacement seats cleanly without added spacers or adapter grooves.
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