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seriously if the pulley was a problem then why does the zl models from SLP come with them and GM offers a full factory warranty on them. My buddy has the ZL427 with SLP mods which includes the underdrive pulley and is fully warantied by GM as he bought new from the chevy dealer so i cant see the pulley being a problem im installing one on my car this weekend and i ran 1 on my 01 ss camaro with no problems
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