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I put an LS1 from a 2004 Corvette in my 71 Camaro. I have Vintage Air AC with the compressor mounted up high. I had an issue with the belt slipping off until I realized that my power steering pulley was not seated completely. I fixed that and now the squealing is unbearable. I have replaced all tensioners, crank pulley, and PS pulley. I have not replaced the water pump yet or the alternator. How do I find what is causing the problem?
Use a mechanics stethoscope to determine point of squeal. You can also take belt off and turn each component by hand, you should be able to feel some drag if it's making belt squeak. Also do a visual of the belt, running it out of alignment could have damaged it.
One way I've found to pinpoint the squeal is to get a spray bottle with water, wet each pulley and see which is the culprit. Sometimes you can take a wire brush to it with the engine idling and "dress" it some and stop the squeal.
When I had my 04 Z06 the belt squeaked since day one after replacing everything on it I looked on the corvette forums and sure enough common problem and their fix was a goodyear gator back belt. I was skeptical but it never made another sound.
First suspect would be the bearing from the pulley that wasn't seated fully, it was experiencing a side load and could have easily gotten trashed if you ran it that way. But any bearing or WP can squeal. Check the ribs on the belt. Stethescope is a good idea. Also try to use a straight edge to check belt and rib alignment. Had a warped balancer once, what a pain that was to trouble shoot. Kept flinging belts but looked fine at rest.
Just don't use belt dressing products, they cause more squeal than it solves in the long run as it induces slippage.