Originally Posted by
Miniliteman The number after 40DCOE is as you said a specific type made/tuned for a specific engine. (70's and early 80's).
Alterations from 'standard' can be jetting, floatlevel, different pressed bushes, linkage ...
In the old days the 40DCOE for the XFlow was the 40DCOE2 but you will not find these easily.
The 40DCOE151 is the modern 'one-type-fits-all' Weber for tuning.
When you buy a used set make sure both carbs are the same type (like 40DCOE31) or are supposed to work as a set (like 40DCOE15/16).
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