2 things that you didn't mention.
Air conditioner compressor clutch. Have you tried starting it with that belt off?
You said that it does it only when cold? I wonder if it could be the A.I.R. pump? It's run by an electric motor and only runs for a little while after cold startup.

Just some ideas

 

I've heard stuff about a 'double idler' pulley. Is that different from the stock one that squeals?

 

Yeah, I've tried running it with the belt off for a minute, my dash lit up like a christmas tree, but no squeal. The squeal would always go away once the car warmed up. Now with that damn Goodyear belt it ALWAYS squeals. I'm going back to a stock GM belt tomorrow. The crank pulley is the only thing left thats still original (other than all the AC stuff) I was thinking about doing underdrive pulleys, think that might help some? I appreciate the help guys but I'm ready to explode. Oh yeah my warranty expired tonight too. Although, thats good and bad (NEW CAM HERE I COME!)

 

It might be one of your pullys is going bad.




Jim

 

I dont feel its your pulleys at all. Its what the pulley is connected to. I would be willing to bet that you have a bad bearing in one of your accesories. Try this...
Get a can of Belt dressing (Note! I dont reccomend belt dressing as a fix , but as a test to hunt down the problem)
spray sparingly on all of your grooves in your pulleys and then go crank the car. If the squeal comes about then its not the belt.
I also agree with guy above stating you should stethescope it.
You can pick up a stethescope at Autozone and it will really pin point the problem.

Mike

 

When you say you replaced the belt with a gatorback I hope you mean belts,cause there's 2 there that should be replaced,a long serpantine & a short one also.If you did both then I don't know what else to tell you but if you only did one try the other one too.