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Message: <blockquote data-quote="stutaeng" data-source="post: 28426" data-attributes="member: 6175">Should be within 1/4" or 1/2" of the original.I remember once my mechanic replaced the AC compressor on my old 4.3 and he couldn't get the belt back on. We figured the remanufactured compressor had a different pulley, since that was the only thing that had been replaced. He went back and got a longer belt from Napa and all went well.The LS has a separate belt for the AC compressor, so that doesn't apply, just an example of how things can throw things off.You either got a different size pulley or wrong belt. Put the old tensioner to figure it out...</blockquote>