Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Put my rebuilt 17057229 on finally

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Mudsport96:
Sorry that was the old numbers. My problem is I have the specs written down on two pieces of paper, so a few specs are different.

SMAB .050
IDLE TUBES .035
DCR.050
MIX SCREW HOLES .077
Upper IDLE BLEEDS .074
LOWER IDLE BLEEDS .063
BYPASS .125
JETS 73
RODS 44B
SEC. RODS AU
SEC. FLAP SCREW @ 3/4 TURN

Reread the section on idle circuit and it said mix holes to be .090 for stock application. So maybe I'm lean at idle? Part throttle is good though, and off idle acceleration for normal driving that's not instant WOT is great

77cruiser:
How many turns are the idle screws out? Do they respond? Could go bigger on them.

Cliff Ruggles:
I'm wondering how you came up with .073" main jets with 44 metering rods?

.125" bypass air is already a pretty big vacuum leak for such a little engine.

If this is a "street" engine you need to use the vacuum advance, or it will require a LOT more in the "normal" driving range to be happy......Cliff

Mudsport96:
Jim, they are 4 turns out.

Cliff, recipe 1 in the book calls for 74-76 jets and rods .030 smaller. Or later-style smabs with .060-.080 smabs 50-52-54m but this is the early .050 smab divorced choke with B rods? Am I wrong on that combo?

Also, I just have to get a new vac canister I plan on running vac advance, just have to replace it.

Cliff Ruggles:
The early divorced choke SMAB carburetors are tuned in a much different manner.  They have an APT system in the baseplate as well, and we make a custom APT screw for them, so you can fine tune the part throttle A/F like the later designs w/o taking the top off the carb and changing parts.

Hopefully you have one of our rebuild kits in it, and I can spec out much better tuning parts when you are ready.

We also have excellent choke pull-offs for them, so you can dial in the release time to provide improved performance going to full throttle against the "tight" converter......Cliff

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