Here is a picture of the vacuum advance port on a YF2100s carb. Your’s should be similar. It’s 1/8” NPT (female pipe thread).
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Last edited by Phak1; 05/09/2023 11:32 PM.

Phil
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1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube
Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc Brakes
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