General Category > Quadrajet Carb Talk and Tips
carb questions
Cliff Ruggles:
The operation involves EXACT precision. If you are off any at all the seal will not fit evening against the seat at the bottom of the threads and it will leak.
I have genuine heli-coil taps for both 7/8"-20 and 1"-20 threads and have installed thousands of heli-coils into Quadrajet and 2-Jet castings.
It is actually pretty rare to see the 1"-20 (1972-up) Quadrajets stripped out. That only happens when someone cross-threads the fuel filter housing. Attempts to install self-tapping fittings may remove needed material required for the heli-coil tapping operation.
I'd have to see the carb to know if it can be repaired or not?....
old blue 75:
Have you ever made or thought of making a new fitting and tapping it 1 1/16-20?
I spent 8 years standing in front of a lathe so making a new fitting isn't the end of the world.
My thinking is to tap it 1 1/16-20 then at the same time take a 1" end mill and re face the seal
surface square to the threads (.003 to .005 thousands).
Cliff Ruggles:
I suppose with enough effort anything is possible.
Unless it were a really valuable Ram Air, HO, Super Duty, Stage 1, W-30, Cobra Jet or something difficult if not near impossible to replace I would just walk to the core pile and get another casting vs spending many hours on that type of repair.
Machining a fitting wouldn't be that difficult until you got to the inverted flare deal. I'd most likely at that point just tap it for NPT threads and install an adapter fitting.
I have the equipment and skill sets, Military trained and I used to make parts when we needed them in the machine shop on board ship when were on deployment, thousands of miles from port and no hardware or parts stores floating around out there anyplace. Where I typically fell short on those sort of jobs wasn't making the part, it was the heat treating if/when needed........
old blue 75:
Cliff thank you very much for your service. Yes I would agree aboard ship It would be tough to heat treat any thing. About the only thing I can think of would be small parts made from o-1 with a torch
and oil.
I under stand it would be easier to use a different carb but Here in Michigan the junk yards ran out of vehicles with carbs on them many years ago. And with the covid crap swap meets have been few
and far between. I will have to think on this while I work on other parts of the truck.
blazer74:
Another .040ish in the hole SBC. Rebuilders flat tops. I’m not alone.
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