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guess maybe more info might be needed...Want to change the power valve and don't know number. It has 61 primary jets and it is on my 5.8HO 1986 F150 4X4. Runs so rich it burns the eyes but no black smoke. not fouling mplugs but I'm sure it won't pass WA. state emissions.
Go to your favorite auto parts store, and ask for a rebuild kit and/or a power valve for a 1986 F-150 4x4, with the 5.8L, with carb tag number E5TE-ZB.
I'm pretty sure it's a Motorcraft by Holley, 4180C-4V. Probably needs a power valve. There are a number of different power valves for the 4180's and its important to get the correct number for your particular application for best performance. The part number E5TE-9510-ZB or the Holley list number 50264-1 should be enough for a competent counterman to identify the correct power valve number. These are two-stage valves and usually run $25-$35 depending on where you buy.
In-but you have to remove the caps over the screws to get to them. Which means removing the carburetor. On some you can drill a small hole in the cap and screw in a sheet metal screw then, pull on it with pliers. Others you saw the carburetor base around the cap to get them out. But in my experience that's not likely the problem anyway, more likely the power valve leaking or the float levels set too high or choke not opening fully. Usually with age, deposits form in the idle passages which tend to lean the mixture rather than richen it. If you do plan to adjust the mixture, count/record the number of turns "in" to lightly seat the screws so you can go back to the original setting if you need to. OBTW, the mixture screws on these have Allen heads rather than slots.