None really. In my frank opinion, although its the world best economy carb, the ADM 34 carb is just way too small. I've seen people put them on 253's and get better performance in a 135 hp Commodre VH though!
125 hp for a 131 and Fiat Argenta with this carb. 131 hp for an Aussie spec XE and XF. The 141 hp figure quoted in the 1982 XE press release was an error,it was for the NZ spec and non Emissions Ford Bronco/F100 4.1.
But since youve asked, then just go up 10 microns from stock in primary and a lot more for the sec jet. Ruel for Webers is 1/20 the venturi size in mm, gets the jet size in mm. 1/15th max, 1/25 th min. Stock venturi sizes were 29 and 29. Ford use EGR to controll emissions, and generally like to richen things up at full throttle, beyond the standard 1/15th rule for rich settings. EGR requires richer mixtures at certain points for saftey, as its possible to get lean outs. If you've removed EGR like on F100/Broncos and NZ Falcons, then it posibly will run leaner jets.
My NZ Falcon had leaner jets than the stock Australian listings
I think the stock 4.1 Oz figures for XE were
Primary Idle: 60
Secondary Idle: 70
Primary Fuel: 160----->180
Secondary Fuel: 170----->195
Primary Air: 160
Secondary Air: 180
Air correctors should go up with jetting, but you'll have to check it on a dyno for sure.
A 32/36 Cortina Weber is bigger in average throttle size, and can make more performance since there is meat to hog the venturis from 26/27 to 29 and 31 mm.
Non emissions and Bronco/F100 4.1 engines down here in NZ never got more than 141hp net with that Fiat 131 ADM 34 carb.
According to Dick Johnstons non turbo SVO XF Falcon project manager, a cam change to 280 degrees, a good old 30/70 cam with 215 thou lift at 50thou, some headers with a good exhast will take a Falcon up to 196 hp with a better than ADM 34 carb. Like a 500 cfm 2-bbl, or a Capri V6 Weber 38 or 40 mm 2-bbl carb.
You can't rout out a Weber ADM from its stock 29 mm venturis to a bigger size as there will be no signal...then carb won't work well.
The EFI went up to 162-164 hp in the XFwith its 264 cam.
