Like Jimmo said, I had the same thing happen back in September, the front-most rib of my belt separated. I figured it was stressed from 6 passes at Norwalk and that I had it just a little too tight. I will be changing out the VW alternator pulley now as well.
I took this pic just tonight...note that the idler is polished on half of it's contact face with the belt, and the belt is shiny in the same travel path area as well. Obviously uneven loading against the pulley face but what is the root cause? There is no belt squealing. I wonder if may be necessary to weld some reinforcement metal to the backside of the alternator bracket at the idler pulley mount, to prevent pulley deflection.
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Red\black 65 Grand Prix 467 E-head stroker, Viper T-56 6-speed, 4.10 spool
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