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I am rebuilding a 1958 4100 carb. I have tagged and bagged all the parts except for the "Venturi Cluster Assembly". The primary and secondary are different. One set has 4 holes in each side of the brass tubes and the other set has only two. Which set is the primary and which set is the secondary?
The set with 4 holes in each side has the letter A , a backwards B, and a 5 as a code. The other has a F with an upside down 2.
Thanks in advance for the help.
Phil
 

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I've noticed on my 2100's that there is usually a corresponding stamp where the venturi goes. I have heard this was becuase of factory calibration or matching. Do either of your mounting places on the carb body have these marks?
 
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