I think the "V" in the pulley gets "polished" and slips, no matter how tight the belt is. I would pull them off and bead blast the V to roughen them up somewhat.
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1968 Firebird 400 RAII M21, 3.31 12 bolt, Mayfair Maize.
1977 Trans Am W72 400, TH350, 3.23 T Top
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Bill Nye.
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