The first numbers in Weber carb nomenclature is size of the butterflies measured in millimeters. The 40 DCOE would thus have 40mm butterflies. The "DC" stands for "doppio corpo" or Italian for "double throat" (ie. 2 barrel in english). The "O" means "orizzontale"...Italian for "horizontal". The "E" is not consistant in it's meaning. It could mean anything from electric choke to trapezoid bolt pattern to die cast carb.
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