440 6 Pack squealing noise only when completely warmed up

[8formulas]

440 six pack 4 speed.

I hate having to bother everyone with this but I can't figure out where this squealing noise is coming from. It sounds exactly like a bad belt. So I did the obvious and removed both belts (alt and PS). Start engine and the squeal is still there. I used a long screwdriver and tried to listen to the timing cover, distributor, PCV valve, block, heads, valve covers. I hear nothing at the screwdriver handle. It sounds like it's coming from up top and closer to the front carb area. Could it be a vacuum leak?

More info: it does NOT make a sound when the engine is cold. It only happens when the engine temp reaches about 150 degrees. Also, if I rev the engine, the squeal gets louder. You would swear it was a bad belt but it's not because I removed them.

Thank you in advance for any tips. Hoping someone else experienced this. Very frustrating.

Mike

 

[khryslerkid]

Vacuum leak could do this. Check vacuum lines, carb and manifold ports and carb gasket. Check carb bolts/nuts. Pcv can do it also.
Good luck.

 

[Fran Blacker]

You said no belts so it can't be water pump bearing. Did you work on anything and the squeal started? Spray a little carb cleaner base of carbs.

 

[Cranky]

If you have a vacuum leak, spraying something flammable at it will make the engine rpm increase right away. May even change the sound of the leak.....if that's what you have.