General Category > Quadrajet Carb Talk and Tips

Newly Built 383 Stroker w/Quadrajet

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Hotrodssnova:
Drilling the plates could bend the throttle shaft if not careful.  All the quadrajets I have seen, maybe 10, have had the body and top cover already set up with the bypass air channels cast in and open. The only thing you really need to do is pull the baseplate and drill the 2 holes out in the proper spot. I would refer to which recipe you are using, and start out on the smaller side of the hole. Once you do this, you could go larger if needed without pulling the base plate. 

Hillbillyenginering:
I bought one set of my drill bits from Granger. Then hobby town for the smaller ones. Fastenal and Tacoma screw when I'm looking for exact sizes.

Cliff Ruggles:
The factory set-up on that carb would not delivery nearly enough idle fuel for that engine combination, even if you thru a ton of timing at it at idle speed it wouldn't have enough.  Take a gander into the carb when it's idling as see if there is any fuel coming off the boosters (nozzle drip), and NEVER drill the throttle plates for bypass air especially from below with the baseplate still on the carburetor......Cliff

ykf7b0:

--- Quote from: ykf7b0 on September 26, 2017, 06:42:29 AM ---To my surprise I was able to get the quadrajet to idle consistently by adjusting the idle mixture screws.  Later on and after the total break in is complete I will really get into the secondaries and see how it goes.

--- End quote ---
Along with the idle issue resolved this engine is everything I had hoped for.  Good vacuum for power brakes,  not too lopey of a cam to run a/c, and runs very strong.   Thanks to all for the recommendations and your sharing of experiences!

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