The Ford Barn

mcorrell · 07-02-2022, 09:36 PM

I am wondering what jets you who have installed a Zenith Model B carb on your stock Model A. I recently rebuilt a Zenith carb that was originally sold as a service replacement for an A as it had the 20 mm venturi. Assuming I need the added flow for a power increase I installed a new 22 mm venturi along with all new jets (not flow tested) that I soldered and drilled to the size specified by Ford for the Model A. My car runs ok but seems a lot lean above 25 mph in 3rd gear. Opening the GAV about 1/2 turn helps a lot.
If I am using the larger B venturi should I also be using the B jet sizes?

07-02-2022, 09:36 PM	#1
mcorrell Senior Member Join Date: Aug 2014 Location: Canotn, NC Posts: 163	Model B carb on stock Model A I am wondering what jets you who have installed a Zenith Model B carb on your stock Model A. I recently rebuilt a Zenith carb that was originally sold as a service replacement for an A as it had the 20 mm venturi. Assuming I need the added flow for a power increase I installed a new 22 mm venturi along with all new jets (not flow tested) that I soldered and drilled to the size specified by Ford for the Model A. My car runs ok but seems a lot lean above 25 mph in 3rd gear. Opening the GAV about 1/2 turn helps a lot. If I am using the larger B venturi should I also be using the B jet sizes? __________________ 1929 (early) Model A Special Coupe - restored to original 1964 Buick Wildcat convertible