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Measured my alternator pulleys Driver's side averages about 78 mm at far outside edge Pass side is slightly bigger at about 79mm. You'll have to trust me on measurements because it's hard as heck to focus on a dial caliper with one hand using a cell phone cam. But I'd say give or take a...

I think I've figured out partially where the discrepancy comes from... Out of curiosity I looked up the p/n for a fan/alt belt on Napa'a website for an '84 K30 with 6.2 diesel. Napa'a site says p/n is 5725. Napa 5725 crosses to Dayco 15480 (same as what I used) So Autozone and Napa both agree...

Info requires several notes on fitment/installation though, and I'm not sure how to add that to the wiki without making it confusing as heck. Maybe admin could make a note? The sizes currently on the wiki are approximately the longest belts that will fit and still work (any longer and you'd have...

These belt part #'s are listed elsewhere on SS but I would discourage using them. Both alternator belts will be on the far/long side of adjustment. The 15455 P/S pump belt is too long IMO and cannot be properly tightened if it's stretched or worn even the slightest bit. These are the sizes that...