from my observations (lets say to be conservative for 1970+) all Pontiac air cleaners used the same sized lid.
The only exception was the TA, and they used (for arguments sake) a standard 4bbl base, with a smaller OD lid to fit under the shaker.
That is to say, that if you had a new 1971 T37, and you wanted to go to the parts counter to get chrome air cleaner lid and valve covers, you would order the same part as the guy behind you who had a new 1971 GTO.
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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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