The quick way to isolate if the noise is internal or belt driven is to simply remove the belt for a minute to test. (only for a minute or less naturally since the waterpump/alternator etc won't be turning) If the noise is gone with the belt off try spinning and shaking each pulley by hand to see it the bearings feel good before you put the belt back on.

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"When you do things right, people won't be sure you've done anything at all" (Bender, futurama)

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RIP 4.6is.....

2003 4.6is