General Category > Quadrajet Carb Talk and Tips

Going to take apart what I just bought

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AZracer:
Hey guys I have a stock 67 GTO and trying to get it to run right. The carb it had on it was total crap. I bought Cliffs book and read it front to back and back to front. I am starting to understand the Quadrajet now. I have mostly worked on Holly Dominators. Anyway I bought a carb from Carbs Unlimited and they said they could fix me up with a what I needed. The number on the carb is 17054909 I was told already that the air horn is wrong but I don't know. In any case I'm going to try and get it to work. Any tips would be Appreciated.

Pat

Cliff Ruggles:
Yes, that's not the correct airhorn, not even correct for that center section without modification to one part or the other.....Cliff

AZracer:
Thanks Cliff for responding. So is a hopless case or can I modifly it in house the get it to work. Do I need to disassemble and post more pictures?

Pat

AZracer:
Well I decided just to put it on the see what would happen. I started right up and idled OK responds good to light acceleration. The air flap is being held tightly shut by the pull off and choke is held open about 1/4 inch. No leaks. I can't find ported vacuum. I don't think the vacuum advance works anyway because when I hook it to manifold vacuum the idle stays the same. I will warm it up and go punch the throttle and see if it's as bad as the other carb.

Pat

omaha:
One way to check the vac advance would be with a hand held vacuum pump like a mighty vac. If the vacuum canister IS bad, you wont be able to hold vacuum on the gauge of the pump. Another good thing about this is you can see where the vac advance (kicks in) on the gauge if the vacuum canister IS goood.(visually with the cap off) Like if the vac advance kicks in at 22 inches  and the engine only has 16 inches of vacuum at idle, then hooking the dist to a engine vacuum source will do nothing while the engine is idling. all depends. the issues you have with not finding the dist vac port may be due  to the mismatch situation with the top/main casting. I would think  that some investigation will be necessary. 

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