Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

help with figuring out my idle issues.

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bruno:

--- Quote from: 77cruiser on March 12, 2026, 03:16:54 PM ---The hex is 1/16 or .0625.

--- End quote ---
ahh. perfect. thank you very much.

novadude:
Jim... what do you do to make sure the setscrews don't come loose?  Having anything threaded like that in the throttle bore makes me nervous.  Is 1/8" long short enough to not protrude into the idle down channel and restrict flow to transfer slot and idle needles?

77cruiser:
Maybe I've been lucky. I don't tap too deep so they fit snug, & yea I used 1/8 in. long ones for the LIAB. If you don't trust them I guess some locktite would work.

mcx:
I use thread lock purple for ease of disassembly…and peace of mind.

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