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Message: <blockquote data-quote="cobrajeff96" data-source="post: 1581627" data-attributes="member: 29141">This lasted about 15k total miles before I corrected it, started noticing the symptom at around 10k miles when I saw that two pulleys (one idler and one tensioner) were dished and not flat as when new. Thought it was weird at first, then filed it away. Couldn't help but notice over the 5k mile observation period that the dishing became more pronounced. So I finally installed a new replacement set of these pulleys the other day and realized what caused it - belt too short/tight. The belt actually work-hardened to such a degree that it wore down solid billet aluminum pulleys over a 15k mi duration, wow. So I got a new set of belts on the way that are 14mm or a little over 1/2" longer. And that should solve that problem.But as you can see, the belt was converterd from 6-rib to 4 once that groove in the pulley forced it to do so. Again, wow.Size your customs belts correctly, don't just trust aftermarket re-sellers to do the math for you. The belt should be able to twist one full rotation, is the general rule of thumb.Long story short, I saved the motor from certain death as that belt operated the water pump. And who knows what would've happened if I was driving the car at speed in the curves if both the power steering and the hydroboost-assisted brakes suddenly went adios. Wow.</blockquote>