General Category > Quadrajet Carb Talk and Tips

Lean on transition

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77cruiser:
Just right off idle it's a bit lean.
Here's what I have.

carb 17082292
idle tube  .036
idle down .055
idle dis. port .094
idle bypass  .141
idle upper ab .068
idle lower ab  .075
main ab .086
pri jet  72
pri rod 50M

I ran it for a bit with a .059 down channel but seemed rich, so I went to the .055 now lean.
I'm thinking I should go to a .038-.039 idle tube.
Am I on the right path?

Cliff Ruggles:
What application?....Cliff

77cruiser:
385 sbc
9.7 comp.
240/240/ 108 solid flat tappet
AFR heads
Perf. RPM
Street cruiser
Auto trans
Idles with around 10" vac.

Cliff Ruggles:
It's going to like bigger idle tubes, and maybe 1-2 jet sizes larger as well.....Cliff

77cruiser:
I'll go up a couple thou. on the idle tubes.
The pri. jet seems OK I had 74 in it but had to have the APT bottomed & I felt it was still a bit rich. Now I'm at about 1 turn from bottom.

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