Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
Set up questions
F250 Restorer:
With my little engine, a 300 with 256 cam, should I enlarge the idle discharge ports before I install the carb?
Also, the secondary m.rods had a slight groove from sitting in the jets for so long. I know this may sound stupid, but I'm guessing I should replace them or they may seep fuel?
Cliff, what do you think about the DR rods, and the G hanger?
omaha:
hey f250 restorer, I think if you do enlarge the discharge ports slightly, it should not hurt anything. (.080-.090)
the secondary rods do not "seat" in the permanent jet holes. they just kinda hang there. dont think it would hurt if there was slight wear in the rods but if you wanna get particular, go ahead and change them. the amount that they "hang" is determined by the hanger. how far they are into the "taper" of the rod determines the "jetting" when the secondaries are first engaged.
The DR rod is not a bad choice and the hanger can be "adjusted". I doubt you will get past the 80 degree air valve opening with the 6 cylinder so I think the moderate taper should work good with the 6. youll probably end up experimenting with the hanger more so than the rods but I dont think it will be too far off.
Another thing I was going to say was about that slight "bind". This is caused by the little spring sliding on the little shaft in the air valve flap tension adjustment area. sometime over time a slight burr develops on the little shaft or the spring might get some wear etc. change out the spring and smooth out the little shaft with some emory cloth. makes the flap nice and smooth when opening. (obviously the flap cant bind either.
F250 Restorer:
Omaha and the rest of you guys who have helped, thanks so much. Rebuilding this carb has really been an experience for me. I'll be sure to mention this forum, and Cliff's help as well, in the up-coming article in True Blue Trucks magazine ... that is when I complete the build.
I read where a lot of the off road guys say to set the float level at 1/4". In my kit it said the factory specs for this carb was 15/32", so I set it there.
Is there any reason I should use the real thick mounting gasket as opposed to a thin one? I am having to use one of the funky spreadbore to squarebore adaptors, so I thought I'd use a thin gasket for heighth concerns, unless the thick one is needed b/c of v.leaks, etc.
Again, thanks for all the help.
Cliff Ruggles:
The thicker gaskets act like an insulator to keep the carb cooler. Not a big deal otherwise. The most important thing is to make sure whatever you use seals it up without any vacuum leaks....Cliff
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