The DCOM series of weber carbs were the replacement carbs for the Weber DCOE production. The Italian Weber DCOE production lines ceased in the middle of the 1980's and these carbs were the next evolution.Weber didn't forsee though that the electronic fuel injection systems would replace carburetors.

The DCOM has improved performance over the DCOE carbs and more lasting on/off use due to the perfected acceleration pump diaphragm and adjustable pump lever.

DCOM carbs will bolt on any standard side draft weber 40 DCOE carburettor manifold and uses the same inner parts, namely jets,needles, seats and floats as the former DCOE carbs.

I believe this information to be very accurate however I wouldn't like to be quoted on it haha.

Hope this has been useful

Matt