Barry I just can't see the factory leaving the bowl vent tube open .....potential fire source should the needle seat stay open, which happens, the earlier year center carb design with the "open" bowl vent, still has a "rubber hat" to seal some what should a high flow/over flow condition exsist,...why put a 3 nipple breather on a car if your using only 2 ports
.....potential fire source should the needle seat stay open, which happens, the earlier year center carb design with the "open" bowl vent, still has a "rubber hat" to seal some what should a high flow/over flow condition exsist,...why put a 3 nipple breather on a car if your using only 2 ports 
