air/fuel mixture

[adamforsythe]

Hello,
I have a 600CFM carb I need to adjust the fuel mixture. do I turn the two screws together or what? Tell me how to do it. Would adding headers, intake, UPGRADED HEI dizzy, plugs, wires, aircleaner upset my air/fuel mixture?
Thanks
Adam

 

[mrk5]

I usually do the following.

Have someone sit in the truck with it in Drive and brake applied. Leave everything on the motor, air cleaner and all vacuum connections, etc. Then I use a handheld tach and adjust the mixture screws an 1/8 turn at a time to get the highest idle. I turn both screws for each adjustment.

My father-in-law does it with the truck in park, everything on the motor. Turns one mixture screw in until you hear it affect idle, and then back out 1/8 turn. Do the same with the other screw. Then he does the proceedure one more time.

Here lately I've just been taking it to a mechanic to do on their gas analyzer machine.

Oh yeah on the first 2, start with the screws about 2 turns out.