General Category > Quadrajet Carb Talk and Tips
What are these holes for?
77cruiser:
I thought reducing the UIAB would help to pull a bit harder on the transfer slot. I know when I reduced the UIAB on mine it richened up a bit just off idle. I think I went .046 to .043.
77cruiser:
What is the number of the carb you are working with again?
Cadman-iac:
--- Quote from: 77cruiser on November 03, 2025, 07:00:43 PM ---What is the number of the carb you are working with again?
--- End quote ---
It's a Cadillac carb #17057230.
novadude:
--- Quote from: 77cruiser on November 03, 2025, 06:56:46 PM ---I thought reducing the UIAB would help to pull a bit harder on the transfer slot. I know when I reduced the UIAB on mine it richened up a bit just off idle. I think I went .046 to .043.
--- End quote ---
I observed the same. With colder fall temps before the engine was completely warm, it was a little too lean off-idle. I recently went from 0.043 to 0.040 and it made more of a difference than I would expect from such a small change. The air horn UIAB location seems to be sensitive to small changes. I would say it got 0.5 A/F ratio richer in the off-idle to 1500 rpm range. Maybe try going .002-.003 smaller on the upper idle air bleed before tearing into the carb.
Cadman-iac:
I haven't changed the UIAB size since I relocated them other than the initial reduction from .048" to .044" when I did the relocation.
Before I try anything else I'll swap out the .044"s for a pair of .042"s and see what that does to the lean zone. It would be nice if it really is that easy, but nothing ever works out that easy for me. Here's hoping my luck changes.
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