General Category > Quadrajet Carb Talk and Tips

I could use some help, please

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Cliff Ruggles:
The stock MAB size on that carb should be .120".  Has it been commercially "remanufactured" at some point?.....Cliff

King Scooter:
Ethan
Thanks for the info and help. I'll look into resizing the upper IAB & I'll check my others carbs for a K or higher hanger. Otherwise I'll be ordering.
Cliff:
According to receipts I got with the car, yes it was "rebuilt" in 1996. I found they closed off the idle bypass air passage through the main body then drilled the throttle plates to compensate(?). I removed their plugs and swapped out the throttle plates so I think I'm back to ground zero again other than the orifice sizes, which I'm working on.
BTW, love your book. As a newbie to Q-jets I just wish it had an index so it would be easier to find the different circuits and terms.
Thanks again
Scott

Cliff Ruggles:
The MAB's should not be .046", so they also need to be removed to use the .076" jets and 43B primary metering rods.....Cliff

King Scooter:
So here's where I'm at:
-Since my upper air bleeds are so large @ .089, I read in the book that my idle tubes should be .003-.004 larger than normal recipe, so I left my idle tubes at .039. Hope this is correct.
-I left my idle down channel at .051, since I can't reduce what I have to the recommended .046
-Can't find any drill bits smaller than .040 so I'm stuck with my accelerator pump discharge  at .022 vs recommended .027
-I drilled out the brass inserts that were installed in my MAB's from .042 to .070. I can remove these inserts if I need the MAB's to be the original .120.  Cliff: do I need to do this or is .070 going to be OK with .076 jets and 43B PMR?
-Secondary POE restriction left at .051 vs recommended .054 since I can only get a .060 drill bit
-I drilled my smaller secondary tube restriction to .040 vs recommended .036. Again I could only get .040 drill bit.
-Secondary hanger is now L since I had one from another carb
-Idle bypass air is now .0625
I'd like to think what I'm doing will be WAY better than what I had. Is this a safe assumption or am I still off base?
If anything looks out of whack please let me know & I'll try to correct it before final assembly, hopefully this weekend.
Thanks
Scott

Cliff Ruggles:
76 jets will be too large they are designed for the .120" main airbleeds.....Cliff

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