Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Did they mix the parts ?

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Kenth:
Chevy BB Qjets of this vintage uses .137" idle bypass, so throttle plate may have been swapped.
Who knows if the carb has been thru an earlier "remanufacturer" and had the idle tubes and downchannels drilled out for a "top fuel dragster", and that the latest company tried to get it back to factory specs without knowing the proper specs?
Easy enough to drill the idle tubes with a #61 drill and the idle down channels with a 1.3 mm to have the correct sizes for this unit. The idle bypass holes in the plate can be threaded from above for 1/4" brass set screws drilled to .095".
This will restore the performance and cure any hesitation.

Erick:
Kenth, I will follow your advice.  I have ordered all what I need. It will take a while before I receive what I need to make the changes.
By the way, how to be sure that the power piston spring is the good one?

Cliff Ruggles:
Just curious, what did Lars tell you to do with that carburetor?....

Erick:
"Yes, you have unfortunately ended up with a "Uremco" carb, which is a horrible pile of junk".
He sent to me an article outlining just a few of the common problems and issues with the "remanufactured" carbs and wrote the fact that they will use mismatched parts and components from various different model years and makes that are not compatible with each other.
With the pictures I sent to him, he told me that the power piston pin was missing and that they should have plugged the air idle system. And it was possible too that they made changes, IFR, restrictor... He was right.
I bought this one without knowing anything about q-jet.
I discover now those carbs...
The problem is that it's not easy to find q-jet here in France, I thought to buy a clean carb and I could buy another one with other different problems..
That's why I'm trying to learn more and it seems that with all the infos I got , it will be possible to restore it to original specifications.

After that, there will definitely be some adjustments to do because my engine is a 327CI with flat top pistons, Edelbrock Performer RPM 70cc heads and Crane Cam H-260-2 Intake @Cam 2847 @Valve 484 Exhaust @ Cam 3027 @Valve 515

Mudsport96:
That Camshaft has specifications of the big block cam. Is that the correct part number? That cam will not fit in a 327

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