Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

No Vacuum at Carb Ports

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Kenth:
Sorry for my mixup on port-#´s, but still the ported source should provide vacuum at slightly opened throttle blades IF the throttle plate is correct for the application.

Looking closer to your pic it seem like you have a "frankencarb" put together with parts from several different units.
F.e. Carter © air horn with Rochester Parts RP choke blade never happened from factory, two completely different plants.

Cliff Ruggles:
I see the WRONG gasket used between the main casting and baseplate on those divorced Chevy all the time.  There was a change made in the early 1970's when EGR started showing up so they changed the baseplate some and the gasket is different.  Since "generic" rebuild kits come with a bunch of gaskets not needed for your carb number it's pretty common to see the wrong one used. 

Of course when mixing/matching main castings and baseplates you have to know which gasket to use for the parts you have selected or there will not be any vacuum at the port coming out on the choke side........

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