In 64 & 65 you could get the 3.90 with M20 or M21
M21 was default for 3.90
M20 was special equipment and will show a different code on the BHC
The only difference between the W code M20 and the Spec Eqpt M20 was the speedo gear.
I only know of about three 65 3.90 cars documented that way.
Could get 3.90 with Auto , also.
The fan has been covered pretty well already.
So if you open the hoods on Day 1 cars , and saw the notched fan ,
but not a tall radiator (trough in lower support) and no metal fan shroud
You would be looking at a 3.90 car - or a factory mistake.
The notched blade fan is the larger fan normally only used on AC cars.
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