Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

17057266 1977 W72 q-jet- changes necessary?

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Cliff Ruggles:
Not really.  It may have a minor effect on things if you have a HUGE rod stuffed too deep into the jets and blocking off flow to the idle tubes. 

I see that on quite a few carbs that come in here as they will have bent PP hanger arms and often one or both of them has the rods pretty deep in the jets.  A bit more common to see hanger arms bent up that down however.  If I take in 100 carbs and least 90 of them will have PP hanger arms horribly bent and the metering rods not correctly located in the jets. 

I did three carbs yesterday, a 1968 Chevy, and two Big Block Marine units.  The 1968 Chevy had one hanger arm bent up at least .150".  Both Marine carbs had one hanger arm bent up about .040-.050" and on the side where a previous "builder" most likely used a screwdriver to pry the piston out of the bore.  It amazes me so many carbs come in here with fundamental issues causes specifically by someone with good intentions but seriously lacking in attention to detail.

I also see folks using early style (long) primary rods in later carburetors which doesn't help anything when it come to tuning......

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