General Category > Quadrajet Carb Talk and Tips
What are these holes for?
novadude:
Allstate carburetor sells pre-made threaded tubes, but tap size is weird (uncommon). I've used these before.
https://allcarbs.com/product/rochester-quadrajet-idle-tubes-threaded/?v=0b3b97fa6688
77cruiser:
I've seen them too, after I had done mine. Wonder why that thread, so they could sell a tap too?
novadude:
No idea. Someone on the other carb forum (when it was still active) bought a quantity of taps in that size and sold me one for a good price. They are pretty expensive to buy just one. I see Allstate sells them in a kit with a tap, but they are not cheap.
Cadman-iac:
--- Quote from: 77cruiser on November 07, 2025, 06:19:21 AM ---OK I see I put 1/2 inch should have been 1/4 inch. I'll measure later to make sure.
--- End quote ---
Well I can tell you that the 1/8" long ones are definitely too short for this. A 1/4" long one would probably be perfect.
I made a couple last night but wasn't happy with them, I'm afraid that the tubes will come out if subjected to too much heat or vibration, even though they're soldered in.
Novadude,
Thanks for the explanation/clarification on the idle circuit. I appreciate it.
Rick
77cruiser:
I measured them & I used 1/4 inch for the tubes.
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