I have understood that most/early 1970 Norwood Firebird Formulas and Trans Ams had air cleaners with no hole, while the Van Nuys air cleaners had the holes;
I also understood that somewhere late in the 1970 model year, it was common place to see Norwood Formulas and Trans Ams with the 'Van Nuys' style air cleaner with the fuel bowl vent tube hole plugged.
My aircleaner is original to the engine going into my car, which is from another manual transmission Formula built the same day as my car;
My car is a first week of June car, and this air cleaner has a paint stamped date code of 3,20 70;
This air cleaner does not have the fuel bowl vent tube hole.
I hope this helps some.
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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.
1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
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