General Category > Quadrajet Carb Talk and Tips

Bigger holes in Main body and Air Horn than First Recipe recommendation.

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Kenth:
Albert, i would open the down channel restrictions to .046" to start with.

A picture where the bypass holes enters the manifold.

And a picture where the accelerator pump jets are drilled (thru the "blue" wall).

HTH

Albert:
Many thanks for your prompt reply Gents!
It will be next week before I can get on with the work.
I will let you know how I get on  ;)

Albert:
JOB DONE !
...up to this point at least - thanks very much for your advice and guidance Kenth and Lightning boy.

When I read both of your descriptions of the correct location to drill for more by-pass air, I banged my head on a brick wall for a minute  :-[ Of course I read about them a number of times in Cliffs book!
I did need your help to locate the accelerator pump jets. I did what my wife would describe as a "boys look", not a proper look!
All holes have now been sized according to your advice, adjustments made according to advice noted in Cliff's book, so, the carby rebuild is done!  ;D 8)

The one question remaining in my mind from your comment Lightning Boy, is regards is how the PCV valve is going to effect the running of the engine. It is a very simple straight body valved tube type, connected to the top of the intake with a tube going to the carby. But I am not too concerned about that as I am sure all will be revealed when I do get to start the engine!

I am currently removing the OEM 2 barrel cast intake manifold to pop on an Edelbrock 2131 intake, so I can use the Qjet.
I will post a couple of final images to round this subject off, and once I have the carburetor fitted to the engine, I will be ready to start the engine and start dialing the Qjet in, as far as I can for now.

See you in the "Dialing It In" section of this Forum!

lightning boy:
Don't over think it. Just see what the factory specified for that engine and try to cross reference one if you have to. It's a controlled vacuum leak, and it's part of the equation, a pcv from a 305 isn't right for a 454 big block in a Corvette. Someone did a deep dive on these once and measured the orifice on each of the part numbered valves for GM that year. Wew!

Albert:
Well, carby is on the engine now ;D
Lightning Boy, If I find an issue with vaccuum I will see what I can find out regards PCV valve specs. Thank you.
Just need to find a 5/8 x 18 fuel inlet nut to connect the fuel feed pipe / tube on to the filter housing nut, then give the engine a crank and see if my work has been a success!
See you in the dial-it-in pages ;)

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