General Category > Quadrajet Carb Talk and Tips

I could use some help, please

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King Scooter:
UPDATE: So I've had a few months to run my rebuilt/modified q-jet on my 355.
I want to say thanks to Ethan & Cliff for all the help.
I am thrilled with how this carb works. It cold starts quickly and idles nicely with just a few pumps of the gas pedal. The only cold start issue is that it sometimes wants to die after a few seconds if I don't hit the gas pedal, but then it straightens right out. Warm starts are flawless as long as I don't touch the gas. I have no hesitation from idle to instant WOT and no dead spots while slowly accelerating or cruising. I'm very pleased, to say the least.
My question: I'm still running the .070 MAB's with the 76 jets.  Plugs are a bit black and I'm disappointed with my 14 mpg. Will mpg (and performance) improve if I open the MAB's to .120 as Cliff suggests, or would I be better off with smaller jets etc?
I almost hate to make any changes at this point since I'm so pleased otherwise, but I'm up for it if that's what's needed.
Thanks.
Scott

Cliff Ruggles:
I'd leave the MAB's at .070" and reduce the jets to 72's or 73's, that should do the trick....

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