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upgrading alt what belt size

lance4682

New member
ok so i bought a high output upgrade kit for my alternator and pulley drop from 62mm to 52 mm.can anyone of you kind sirs tell me what size serpentine belt i need the car is a 1999 grant prix gt non supercharge
 


Being a 10mm diameter pulley drop, I would try the stock belt you have sitting there first and see how the tensioner marks look. If you are out of spec, usually the smallest drop in belt length is about .5".
 
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