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i don’t know how or where the “Venturi” is to measure.. I’m very newb too this hahaLooks like you are going to get lucky, but check your carb to see that it has the same size venturi? The one on eBay shows 1 3/16 best I can tell in the pic. Compare with yours. It is cast in the front left face of the body.
V-4 carbs were made from 1" to 1 3/8" over all the years so lots of different sizes for different horsepower outputs.
Thank you again. The new/used carb came in the mail yesterday. Cleaned her up and ready to instal!!! Thank you