General Category > Quadrajet Carb Talk and Tips
Float level and other Qs
Cliff Ruggles:
I'm a little confused and not even sure which carb you are using and how it is set-up.
Above you mention 77 jets and 49B rods which would be for a 1974 or early model, not the later Q-jets with the APT system located directly in front of the power piston. B rods are longer and used in many Buick, Chevy and Olds' carbs thru 1974.......Cliff
Macadoo:
Sorry Cliff, I've been working on three different carbs, lol.
This is the '81 APT carb from a Checker cab. I thought I read in your book that the longer rods could be used as long as the APT is set correctly but I may be mistaken. I'll read over that again.
The gasket pictures I posted earlier were for the carb that I ruined by drilling through the main nozzle. I wanted to use that one because I knew that it was recently bushed. It turns out that all three were recently bushed so I'm back to the '81 APT model.
I apologize; I'm trying to do too many things at once because I'm running out of summer.
Macadoo:
Yeah, I misread the sidebar about the rods. My bad. Again, I just need parts in there so I can test the carb for leaks before buying parts. I'll go with the P rods I have and 74 jets, for now.
Cliff Ruggles:
Correct, "B" series rods will be too long in the later APT models.
You can use the later K, J, L or P rods in earlier units if you team them up with different style Rochester jets.
Rochester Quadrajet main jets have the actual orifice much lower in the jets than some other options that are out there.......Cliff
Macadoo:
Thanks Cliff. One of the "rebuilt" M4MC units I purchased last year had M-rods. Aren't those marine?
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