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question about strange hole in carter wd-0 buick 1940

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Hello all,


in the process learning about my car that i now have for a few weeks, i was looking into the carburetor. I hooked a smoke machine to the system to check for leaks and only the airfilter the smoke came out as it should and 1 location on the carburetor. This was strange to my. so i found a picture on ebay with the same hole. I dont understand the meaning of it. Looks like false air can come into the carb this way right? i circled the location of the hole.


I have a 1940 Buick special model 41 which is still quite original. starting is with pushing the gaspedal, the carb is a Carter WD-0. Who knows the reason of this hole.



carter wd-00.jpg

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