Not Ranked
I don't doubt anybody's reasons, they can use them for whatever they want. I asked on another forum for more input and here a couple replies:
Some AFB carburetors also had those and I think that the idea was to allow fuel vapor to escape to the outside instead of letting it go down into the intake and flood the engine under a hot soak condition.
They were put there for two reasons:
To vent the venturi above the plate during a hot soak situation and, (in that particular position), to create a small air stream at Wide Open Throttle above the shaft for better atomization at a spot where fuel tends to collect.
The EPA and hydrocarbon air restrictions did away with any of that type venting on later model carbs.
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