I have a 13b 6 port with a rb header and a Weber 48 Ida. My timing is set @ 13 degrees. I am showing a 10.0 at idle on my wideband no matter what I do to the carb. Right now I have the set up below.

205 jet
200 main jet
F11 emulsion tube
.300 needle valve
.50 idle jet

 

Forgot to add Fuel pressure is set @ 3 psi. I have a fuel pressure regulator and return line.

 

look

 

I suspected the motor was flooded and wired up a fuel pump cut off. I cut it on and let it idle for 10 minutes and the wideband showed a 10.5 at idle. I made further adjustments with the idle mixture screw and got it to 11.5-12.3 idle at 1000 rpms. But it still sounds alittle rough. The idle mixture screws are a full turn out. I will look into the setup that was posted above.

 

ideally the idle screws should be in the 1/2 turn out area, if its a full turn its ok, but its telling you that you could go down an idle jet size

you also might want to look down the carb while its running, if its dripping from the boosters at idle, the float is too high. its ok for a race car, but in a street car it'll be too rich

 

 

it is a small idle jet, but you can't be too judgmental about it. if your car wants a .50 then that is what should be in there

 

I just cut the car on let it idle. Weird question, but the booster is located in the center of the venture. The little circle tube in the middle upper area of the throttle plates?

 

Sorry for the late reply I have been hunting down and fixing leaks. Now the car oil temps are going high. I have a 19 row oil cooler that i am about to put on the car with a electric fan.