What a coincidence as I just finished getting my old ’58 LeRoi air compressor running after sitting for a few years and it is based on an Allis-Chalmers design. It also has a Zenith updraft carb but I didn’t take note of how much meat was in it for a thread repair. Both the hi-speed and lo-speed jets on it are adjustable and one faces the front and is under the bowl while the other is on top and comes out on a 45 degree angle.
If you can wait for a day or two, I can remove it again for inspection but first I have to reinstall the transfer case in my Exploder but in the meantime I’ll post a photo of the carb for comparison. That won’t be for another hour or two.
