Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Tuning suggestions for a 7044276 carb

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Shark Racer:
Thanks all for the help.

I've put a couple hours into this carb now; installed new upper main air bleeds and sized the lower. Looks like 070 lower, and I sized to 070 upper. I know we should have shot for 067 lower but it's hard to shrink a hole and probably not worth the effort to drive a new bleed in there? The upper was at 081 before.

I've found a few problems with the carb, some of which would likely explain the issues he was seeing:
1. Secondary air valve door, passenger side was binding.
2. Secondary air valve tension was very low at 1/2 turn
3. Crack in primary throttle plate near linkage (will rebush)
4. Float level low (~1/2")

I still need to bush the throttle shafts and stake the air valve screws. We're planning on getting the car back on the road on Sunday. Should be fun! I expect it to run a lot better.

Here's the car it's going into (gunmetal bird):

Cliff Ruggles:
Nice ride!

You are finding out why we hate to see commercially "remanufactured" carbs come into the shop.  They ALWAYS require more work to get them up to par than original "virgin" units.

Still should be able to get a good end result.....Cliff

Shark Racer:
Gui is quite happy with the carburetor. This is the "fourth" carb he had on the car.

He started with a Holley, then switched to this. This had the bogging trouble so he switched to an Edelbrock 1407, which he was happy with.

We got the carb on this morning and took it for a drive. The first thing I noticed was the prodigious torque of the 400 - and it didn't feel bad at all at high RPM either! There was a slight hesitation going into the secondaries, which may be because he unhooked the pull-off and forgot to put it back on. Whoops.

Regardless of our little "gotchas", he was absolutely THRILLED with the carb. Said it was "night and day" vs the Edelbrock.

Thanks much for the recommendations and the parts, Cliff. :)

Ethan1:
 Nice ride is right! 8)

omaha:
 Sweeet.....looking ride!  I always like the early firebirds (more than the Camaro's).

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