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).
Got it, I see that on my throttle body. Thank you! I just have to get the float adjustment set tomorrow, reassemble, install and try it out. Comes at a great time, my 2006 crew cab silverado was stolen today and it's my daily driver. Or was anyway. So Tina, the 46 truck will have to take up the slack for the time being.
