General Category > Quadrajet Carb Talk and Tips
Symptoms of a warped bowl
Cadman-iac:
--- Quote from: GSP7 on December 14, 2025, 09:35:32 AM ---Is the bottom of the main fuel bowl to base/ throttle plate where the thick gasket goes supposed to be kinda curved / not exactly flat? Then the thick gasket compresses and seal .
That Qjet power dude has a video where when tightening the screws base plate to bowl bottom, you shine a flash light in there to see and gaps where light shows a void, and then tighten the screws until the gasket quenches and seals with no light visible
every one of my parts carbs, disassembled (5) bowl bottoms surface is curved a little where the base plate attaches,,, but the top is flat and air horn is flat
--- End quote ---
I've noticed that several of mine were not flat across the bottom of the bowl, but most were not too bad. This particular carb, if memory serves, is worse than the others.
I've used a flashlight to check the throttle plates to see if they're fit properly, but hadn't thought about using it for this, good idea.
In an effort to test if this warpage is the issue, I've thought about using an old gasket and filing it thinner at the sides so it's thicker in the center, just to eliminate this as the problem, I just haven't gotten around to it yet.
Thanks for the idea.
Rick
Pav8427:
All the warpage that I have delt with is at the point on the fuel bowl where the verticle baffle is in the secondary bores. The weakest part of the casting. Some claim they may have warped when pulling out of the mold. Warpage follows both top and bottom of the fuel bowl and is easy to see with a straight edge across both top and bottom.
Some warped pretty bad, but whenever I have pulled them apart the throttle body is always flat.
Cadman-iac:
--- Quote from: Pav8427 on December 30, 2025, 12:02:38 PM ---All the warpage that I have delt with is at the point on the fuel bowl where the verticle baffle is in the secondary bores. The weakest part of the casting. Some claim they may have warped when pulling out of the mold. Warpage follows both top and bottom of the fuel bowl and is easy to see with a straight edge across both top and bottom.
Some warped pretty bad, but whenever I have pulled them apart the throttle body is always flat.
--- End quote ---
Yes, that's the area I've found that isn't flat across the total width of the bowl. And I've found the base plate is usually flat too. Go figure!
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