General Category > Quadrajet Carb Talk and Tips

Mild 350 rods and jets

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Cliff Ruggles:
Did you use the APT system to fatten it up at light part throttle?

Do you have full control with the mixtures screws at idle or is it lean there as well?

If it's fine when you push harder into it then the jet size and rod tip (.036") are adequate. 

It's difficult if not near impossible to read plugs with this new fuel but they should be very light tan to almost white.  Remember this is a Q-jet not some pig rich gas sucking Holley or Carter AFB clone.......Cliff

omarghazzy:
Thanks cliff

I tried to pull the APT 8 turns up and its better on cold days

Idle screw I can close all the way and it wont die but I have it 2 turn out and its happy
Im not in the US so limited access to part
Old jet performance sticker on carb tells me this is a stage 2 so whatever mod they did to it

Is this a good carb knowing it came from mid 80s truck or should I find a 77-79 carb instead

Can I up the jet one size or to and keep this 50m rod

Thanks

Cliff Ruggles:
Before you do anything check the power piston hanger arms to make sure they are EXACTLY even and level. 

I haven't taken one of those apart yet that were even and level......Cliff

77cruiser:
Cliff do you have a fixture to check them or the well trained eye?

Frank400:
Is this a single main air bleed carb ?

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