Not sure based on any springs. Mine is stamped 14C on top of the carb right in front of where the air filter boot attaches. My right carb is clearly stamped where as the left has no visible stamp although the do appear to be a matched set. I also have some spare 14H and 723 carbs that are stamped on a flat surface below where the air boot attaches and just above the float bowl. Hope this helps.Help me with the carbs: Is the 14C carbs without right side spring or is it 14E? My right side has no spring so I thought it was 14E.