How wierd is this?

Background info. I have a 292 Chev six in my '37 Chev pickup. The motor is mildly built with a cam, .060 overbore, and my carb is a 390CFM Holley 4bbl.

This thing whistles in the carb like a MF. At cruising speed it is almost enough to drive me to distraction. I can modulate the noise with throttle, but not much. I have changed air cleaners with no help. No air cleaner, same shit.
It's a good thing I don't have a radio 'cause I couldn't hear it anyway.
Anyone got any idea how to cure this?
PanheadGuy

 

look for an air leak

 

I had a 300 ford that did that, it was an intake leak that was hard to spray carb cleaner in, so I had a hard time finding it, but thats where it was. ran ok, but whistled LOUD on hot days.

 

I'ts a vacuum leak. Find it,fix it and will run much better

 

Are you running an adaptor between the 4 bbl Holley and possibly the two bbl straight six intake manifold? Or just an adaptor period? I have had those adaptors whistle. There really was no intake leak, it was just the shape of the 4 down to 2 that did it. I had to grind a little away and reshape things a tad.... It only whistled under a hard throttle, you could almost play a tune with it... This is why you should only use six one barrels

 

hell don't fix it it my keep deer from jumpin out at your ride lol

 

Had an oil cap sucking air [thru its gasket] made the same screamin sound!

 

Lots of good ideas here and i'll check them all out. Thanks for the help.
Guy