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To quote from HPBooks "Weber Carburetors" by Pat Braden:
The prefix always indicates the size of the throttle plate i.e. 40 DCOE is a 40mm throttle plate. The letters immediately following the prefix refer, in Italian, to the general type of carb. Only a few terms are consistent: "DC" means doppio corpo, or double-throat. "V" means verticale (vertical) and "O" means orizzontale (horizontal). The "I" in IDA seems to mean invertito, or inverted. Yet, there are no updraft, or inverted, Webers; the IDA is a downdraft.
Other even less-consistent single-letter designations are:
· E: Die cast carb
· F: Ford (of Europe) or Ferrari (?) application
· V: Carb with power valve
· A: Water-operated automatic choke
· G: Progressive rate
Weber carb nomenclature is chaotic. The IDA may be 2-3 throats, and there is no choke at all. The "E" in DCOE indicates either a trapezoid bolt pattern (in some applications), or a rectangular pattern. The DCN fitted to the Lamborghini was a DCNL, but if fitted to a Ferrari, became a DCNF!
Any questions?
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