Since you didn't have any change when you took off the belt, I would check the spark plugs to see if they are tight. Is the noise continuous or cyclic? For example: eeeeeeeeeeeeeeeeeeeeeeeeeeeek, or eck, eck,eck, eck, eck.....
There have been more than a few with a similar noise that turned out to be a loose spark plug.
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2000S Ocean Blue Metallic- 116K
3X Water Pump, Clear side markers, Crios Mod, Front engine mount, Flywheel, clutch, RMS, AOS, MAF, serpentine belt, power brake vacuum line, battery, 2X CV boots, Fuel filter, Oil filler tube, 3X ignition switch, 90K service, gas cap, Coolant tank
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