except M20 is actually an RPO code.
That RPO code has in essence been used to describe a version of the Muncie four speed.
I used to know the “SM—-“ code that GM used to designate the Muncie four speed, except I can’t recall it now.
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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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