General Category > Quadrajet Carb Talk and Tips
17057512 factory specs
Cadman-iac:
Interesting, thanks.
Can you post the federal specs for this carb, what would that be, a 17057212 maybe, if I read Cliff's book correctly?
Rick
Kenth:
The 17057512 is used on California 1977 Chevrolet & GMC Truck 454 CUI engine Heavy Duty for M/T & A/T trans. C-10-20-30 PICK UP SUB P-30 MOTORHOME.
There is no 17057212, but there is a 17056212 for 1976-77 Truck M4MC for 454 Heavy Duty Federal usage C-10-20-30, P-30, MOTORHOME.
Cadman-iac:
That's perfect, thank you. I wasn't sure what the federal carb number would have been, so I took a guess.
Much appreciated Kenth.
novadude:
Kenth... your post about main nozzle air bleeds intrigued me.
Let's say you have a Chevy carb with the 0.029" bleed vs a Cadillac carb with an 0.050" air nozzle bleed. Assume all else is equal (the other two MABs, idle circuit, jets primary rods, etc). How would this affect the fuel curve? I would assume that the larger main nozzle bleed would delay start-up of the main system, and maybe require a larger main jet to maintain the same fuel curve? Just curious if you have any experience with how different main nozzle bleed sizes typically impact the calibration requirements in the rest of the carb? This is one area of a q-jet that I've not seen discussed often.
Cadman-iac:
--- Quote from: novadude on February 19, 2025, 01:50:38 PM ---Kenth... your post about main nozzle air bleeds intrigued me.
Let's say you have a Chevy carb with the 0.029" bleed vs a Cadillac carb with an 0.050" air nozzle bleed. Assume all else is equal (the other two MABs, idle circuit, jets primary rods, etc). How would this affect the fuel curve? I would assume that the larger main nozzle bleed would delay start-up of the main system, and maybe require a larger main jet to maintain the same fuel curve? Just curious if you have any experience with how different main nozzle bleed sizes typically impact the calibration requirements in the rest of the carb? This is one area of a q-jet that I've not seen discussed often.
--- End quote ---
I'd like to know how this affects the fuel flow too since I'm using a Cadillac carburetor on a small block Chevy. Is that nozzle bleed too big for a smaller engine?
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