As I mentioned earlier in this discussion (and Baron seemed to confirm) the 1968 D-port ‘Ram Air’ engine never came with the 7028270/7028273 carbs;
These application numbers were introduced with the “Late” ‘Ram Air’ engine, which we now refer to as the RAII.
To try to clearly say this another way, those application number Quadrajets were only used in 1968 with the round-port ‘Ram Air’ engines.
Some literature refers to the RAII as “1968.5 Ram Air” or “1968 Ram Air (late)”.
Yes, the fourth digit on “70” Quadrajet application numbers does normally indicate model year, but these two application numbers were two of a few exceptions;
These application number carbs were carried forward and used on some early 1969 RA cars.
I cannot speak as to if they were only used on RAIII vs RAIV engines, because I do not know this.
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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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