[Tarl]

Well, its more of a screech really. My 66 lemans with 70 455 has always had a bad squeal when stabbing the throttle. I finally got around to trying to diagnose it, I always thought it was the alternator but it's not.

I have 2 belts, alternator and power steering (no AC) and it screeches pretty bad when I hit the throttle to about 3k. If I pull the alternator belt it does it, if I pull the PS belt it does it. If I pull both it doesn't. Bought a new belt and still does it. Pulleys look pretty well aligned.

So I am assuming its the water pump bearing. But it seems really solid, no wiggle to it at all, no leaks. It's a PRW aluminum one. Could it be anything else causing this like the fan clutch? its a Hayden SD.

Any thoughts before I open it up to replace the water pump?

Thanks!