Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Which choke? 7044240 Buick qjet

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Trans Am:
So I guess my initial question was never answered: can I get an "electric divorced choke conversion kit" and make it work?


If there is a pressed in N/S, does that mean you can't replace it with a proper screw in type?

Trans Am:
So here is a list of other Qjets I have laying around. Can you tell just by the numbers which one might be my best selection? Or do you need pictures of each unit?
Are the two 1975 units the dreaded ones that are useless?


7045505

17059553

7045224

17056228(tinkered with and "remanufactured"

17059530

17058512

Kenth:
17058512 Chevy style, needs .050" main airbleed inserts or different jetting.
17059553 Olds style.
17059530 Cadillac style, no hook-up for TV cable.

These are fine 800 cfm castings.

Cliff Ruggles:
With enough "cobbling" you could probably make an aftermarket electric divorced choke work. 

They are marketing electric choke conversions for the divorced choke carbs.  Have had a few sent in here with them in place and NOT a fan.

If you run into a "pressed in" N/S assembly the carb is JUNK.  That modifications removes the threads for the OEM style seat.

The best carb in your bunch with minimal work is the 17059553. 

Use a short filter housing on it and one of my Marine filters.  Convert to E-choke.  I can provide a rebuild kit with tuning parts so it's dialed in exactly for what you are doing right off the bench.

The big Caddy carb is second, and you can replace the throttle shaft with one from a later model Chevy carb.  It a little closer than the large MAB models without as much work, but no better anyplace otherwise.

I spend at least 8-10 hours every day putting together custom rebuild kits with tuning parts for these carburetors.  I just need ALL the engine/drivetrain/vehicle specs and a carburetor part number.  At this point I know all the numbers, what they came with, and what they need to use in any particular application.........Cliff

Trans Am:
Can I also ask, are the two 1975 units absolute crap without a doubt or do they need to be torn down to see if they have that balance port?

Kenth, thank you for your clarification, that helps me in the future with those carbs no matter where they go.

Thank you cliff, I'll get the 9553 and take some pics to let you see up close if it seems ok.
Later today or tomorrow I'll reply with as much info as I can, but I'd like to say now with all openness: I just got this truck a month ago. I was told the engine was rebuilt but I have NO idea if it was a stock rebuild or what. I don't know the bore size if it was changed. I don't know the cam if it was changed. I don't even have the rear gear exactly but could verify roughly using a speed test. The diff cover doesn't leak and i don't want to remove it to inspect the teeth for ratio. Factory manual says it can "only" be a 4.10 but who knows.

This is a work truck and the old 402 big block will probably never see over 3500 rpm for the rest of it's life.

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