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but you claimed that you need that open to vent the bowl and thats not true because there is another vent that is built in and the bowl and that WILL vent with that port plugged. and that was my point.



I think I if you read both of my posts above again, I never claimed the bowl vent valve hose nipple to be the primary fuel bowl vent and should be left un-plugged for that reason. As you have stated, the primary bowl vent is cast through the air horn. My point was/is if you are not running an evaporative recovery system of some kind, it is intended by design that that nipple is to be vented to the atmosphere as was the pre-71’ “rubber plug over a hole” bowl vent valve.



If you look at the Chevrolet Corvette Holley Tri-Power carb,the only vent is the one cast in the bowl.1970/71 emission standards required it to vent bowl vapor into the canister instead of the atmosphere.It is not needed.If it weren't for California,we probably still wouldn't have one.