In looking up some info on old Chevy dipsticks, I came across this:

55-57 ALL (6 cyl) (2nd Ser) ( exc. D-D)

There's another reference to: (exc. D-D, COE)

What does the D-D stand for?

Thanks
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1948 3/4-Ton 5-Window Flatbed Chevrolet

34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.