General Category > Quadrajet Carb Talk and Tips

Help me decide which carb to rebuild

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Cliff Ruggles:
I'd use the 17057229.

Mudsport96:
Sorry for the delayed response. I like to do my best at reading the entire forum instead of asking too many already answered questions.

I am going to go with the 17057229 as per your suggestion.

As i was reading through the older threads, i came across one particular one from 2011 addressing Single MAB carbs and tuning. It says to tune the SMAB carbs like you would a Edelbrock 1910, but the one you were referring to was a later casting. So would tuning a EARLY SMAB 750 unit be the same, or should i tune for a leaner setup? Or do the smaller primaries even matter that much??

here is the post I took the info from


--- Quote from: Cliff Ruggles on June 13, 2011, 04:00:39 AM ---"M" series rods are also "stepped", it's just not as pronounced as the "K" and "P" series rods.

A 50M metering rod tapers from .050" to .040" on the upper section, then steps to .036"

The "M" series metering rods and made for the later single main airbleed carburetors, as they have a stronger signal to the jets and less emulsion air coming in as the earlier styles with two pairs of main airbleeds.

The SMAB carbs started showing up in 1977, on Chevy trucks, but were still the early divorced choke units.

In 1979 they started showing up on Chevy applications in the later APT style carbs, and were in place across the board around 1980 (side inlet castings only).

When tuning SMAB carbs, refer to the last Chapter in my book on the Edelbrock 1910 units......Cliff

--- End quote ---

Appreciate the help

Andy

Cliff Ruggles:
Those carburetors used different metering rods and APT system and tuned in a different manner than the later APT style.

We make an external APT screw for them, and can help with rebuild and tuning parts to get it set up exactly for what you are doing.....Cliff

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