Hi Forest,
My GUESS is that it is a vacuum generator. I think your dash-air needs vacuum to operate.
BTW I currently "borrowed" the pic of your Newell for my 'puter desk-top wallpaper. I really like the paint design.
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1993 Newell 45'#316, 1976 Trans Am 455, 1967 GTO, 1953 Chevrolet 3105 (panel truck),1952 Chevrolet 3600,1969 Airstream Overlander. Always fixing something!
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