Idle needle adjustment range

[garybohannon]

 How many turns out is reasonable for a 1979 q jet with fine thread needles?
I have mine out 8 full turns before the idle is good. It still is a little weak, going into gear, until engine is fully hot soaked.
 This is with the throttle fully closed... screw fully retracted.
One turn into the trottle, on the idle speed screw, results in nozzle drizzel at idle.

Do I need to open the .038 idle tube, or .058 channel?
Do I need to shrink the .106 air bypass?
Do I need to shrink the .070 Upper air bleed, or go to .050-.052 in the air horn instead?

 I have a 455 Buick with Kenny-Bell C118 cam 228-246 118 spread, 9.5 comp, ported stage 1 heads. (12.5 ET, 3800 lb, 3500 stall, 3.42 gear)

[Cliff Ruggles]

If the idle speed screw is fully retracted, the idle speed should be pretty low, if not stalling out the engine.

.106" idle bypass air isn't much for an engine that big with that much cam in it.  It should have you off the main system and full control of the idle speed as well.

If you have .080-.090" holes under the mixtures screws, you should get the adjustment within range by 4-5 turns out from seated.

It should have plenty of idle fuel as well with .038" idle tubes and .058" idle downchannel restrictions with that cam/cid/compression combination.

I'd verify no vacuum leaks, and go larger with the idle tubes if you still have the same symptoms.......Cliff

[garybohannon]

 I forgot to tell you the idle needles are at .096 right now....

All vacuum holes plugged and rechecked

....so, which thing do I tweak for 3-4 turn needles adjustment and little steadier grip when  dropping  "neutral" to "drive"

(Idles fine about 750 - 800 rpm.....12-14 initial timing and 12-13" vacuum.)

Planning to do a 2nd q jet with one of your kits and get PERFECTION next time (with your help of course).