Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Nozzle Drip on Stock 454 Engine

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Roger3:
I took the 7041204 carb apart last night. The carb was very clean inside. Jets and rods are correct according to my spec sheets for a 71 corvette. Here's the size of bleeds:

Idle Channel Restriction .049
Idle Tubes .035
Idle Air Bypass .099 (this is much smaller than other carb 0.140) Cliff Recipe doesn't give a number for this
Idle Mixture Screw Hole Opening .079
Air Bleed Bushing in Air Horn .041 (this is much smaller than the other carb .073) Cliff Recipe 1 says .050 to .052

Any recommendations on what to change first (idle air bypass or air bleed bushing or something else)?

I ordered a few parts from Cliff (idle tubes and idle channel restrictions). When they come in I'll put it back together and update the results.

Roger

Cliff Ruggles:
A stock 7041204 carburetor would have the large main airbleeds in the airhorn and in the main casting.  If they are clear down at .041", someone has altered the carburetor, or it is commercially "remanufactured"......Cliff

Roger3:
Cliff so what changes should I start with?

Cliff Ruggles:
Might want to try setting the carb up to factory specs for idle tube, down channel and idle bypass air.

If someone has reduced the MAB's to smaller than .118" then make sure you are using the correct jets/metering rods for the changes.

I would also install our orange PP spring for the BBC application......Cliff

Roger3:
Cliff,

I ordered the idle tubes and restriction orifice from you with the carb listed.

Where can I find the size the orifices should be? I checked all the books I have (GM service manuals, quadrajet books, etc) and can't find that information.

Thanks,

Roger

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