General Category > Quadrajet Carb Talk and Tips

Upper Idle Air Bleeds

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Frank400:
...or drill with a number 35 drill bit (.110") and install  a 6-32 setscrew which you can drill to the size you want.

77cruiser:
That was my thoughts.

Cliff Ruggles:
The MAB's are close to the two screws that attach the airhorn to the main casting.  The idle bleeds are closer to the front and much smaller often having brass inserts in them.

The MAB's should be around .070", the idle bleeds closer to .050" on that carb number....

jagness:
Okay, I wasn't confused then about which bleeds were which. This carb is weird because the IABs (closer to the front) are .070 and have no inserts. The MABs (right next to the screw holes) have inserts and are .046.

Sounds like I'll have to install inserts in the IABs and enlarge the MABs quite a bit. Is it best to press in brass inserts or tap it for 6-32 set screws? I'm leaning toward brass inserts.

I wish I could post a pic. Maybe I'll email it to you.

Thanks everyones! Cliff's book, emails, and phone conversations, plus this message board, have helped me enormously on several Quadrajets now!

jagness:
Installed brass inserts in the IABs, drilled to .048. Getting there!

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