[HO455]

The fact is that some carburetors cannot be made to work properly.
Improperly machined at the factory, physically damaged at some point, allowed to get wet and corrode or just mismatched components. The tolerances inside are small and precise. A couple thousands here or there and the fuel and air cannot not flow as designed.
See my earlier post 162.
Any ideas on how many Qjets GM replaced under warranty?
How many of those are still floating around being resold as NOS carburetors?
I know of one very rare Pontiac Qjet that has been bought and sold a number of times for big money. A beautiful looking carburetor that simply will not work.

I wish you the best of luck finding what you want. If you can't find the problem and need a new core let me know and I can make some calls.