Open plug on carburetor? 1978 Ford F150?

chris barley

New member
On my carburetor there is a hole where it looks like a plug is supposed to be. If you are looking at the engine and carburetor head on, it seems to be right there in the middle of the carb. it ussually smokes after I start it up for a few minutes. Is there supposed to be something there?
 
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