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Message: <blockquote data-quote="dcm0123" data-source="post: 1449191" data-attributes="member: 22542">Could be junk pulley or maybe there is  play in the mounting holes and you have to align it to make it straight. I assume you are talking about AC delete pulley which is next to PS pump.Power steering pump pulleys are pressed on to the shaft. I believe they have to be pressed on a specific amount, no necessarily to a hard stop. Use a strait edge on PS pulley to make sure it lines up with crank pulley.Have an 351W in mine. Had a lot of problems destroying belts until I bought an aftermarket billet aluminum tensioner pulley which had a flange on both sides. For some reason when engine was reved the belt would shift on the tensioner pulley then jump off the alternator pulley. <a href="https://www.steeda.com/steeda-mustang-aluminum-tensioner-pulley-555-3325.html" target="_blank">https://www.steeda.com/steeda-mustang-aluminum-tensioner-pulley-555-3325.html</a></blockquote>