A few weeks back I made a post on a Mustang forum I frequent,needing trouble shooting help with an autolite 1.12 4100 that I was trying to make work on the 302 in my 62 Galaxie.  After much discussion and trouble shooting I found that it was a vacuum leak and was able to get it working OK but not as good as the Edelbrock I had removed to install the Autolite.  Obviously the 1.12 carb that I have was setup for a big block and my 302 even though performance is no big block.  Throughout the discussion on that thread I was given a couple pieces of key information, first Pony Carbs use to sell plastic inserts to convert the 1.12 carb into what they call a "spread-bore" carb.  They worked simply by sizing down the venturi.   Further research on the net provided info where a guy used a plumbing adapter to modify his 4100.  his attempt while functional was a little crude for my tastes.  The second piece of info I receive from my previous thread was a link to a carb forum that after a little searching provided tons of info on this "spread -bore" mod as well as some suggestions as to jet size.

My plan after doing the research was to rebuild the Carburetor, replace the jets, and make my own sleeves.  The rebuild has begun. I have a rebuild kit, and have fully disassembled the carb.  The jest that came in the carb were 55/62 and I need 49/55 so I will order some 49 jets to replace the front ones and move the original front jets to the rear.  The sleeves were the next thing to tackle.  I made a set out of some coper pipe.  I cut it to length and faced both ends on my lathe.  I then flanged the top of the sleeves and cut a notch in the bottom of the sleeves.  Once I had the rough shape I had to slightly work the outside of sleeves with sandpaper to get a nice fit in the bore of the carb.  The final result is a sleeve that can be pressed in tightly by hand.



as you can see from the following pix the fit is nice and I am hoping that that will work as well in reality as they do in theory.