General Category > Quadrajet Carb Talk and Tips

Calibration of 800cfm unit for mild 350 Chevy

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tayto:
Canadian fullsized cars (b, d and g body for example) and trucks had non ecm controlled qjets right up until TBI took over.

77cruiser:
Had non ecm carbs on trucks over here till middle 80's too.

anvilhandsmagillacutty:
Please excuse my sarcasm, and understand it's not really intended to offend. Just my nature and off sense of humor. I thank you for your help. I think my carb is indeed a 5.0 liter truck carb, and already has suitable idle circuits as well as main air bleeds. I just wanted a suggestion on jetting for the non stock engine. With cam, headers,
 etc

77cruiser:
The jets & pri rods are probably fine as is, but with that cam you may need to open up the idle tubes & down channels a bit. Similar carb I have on a 327 & I went to .036 on the idle tubes & .056 down channels.

Cliff Ruggles:
Looking at the engine build the carburetor is going to need help in all areas, starting with the idle system.

Jet and metering rod requirements are based more on what you've done to your engine, and how the carb is set up from the factory than anything else.  Looking at what someone else did for a different application, or using a different carb number, or both, is useless information.

You need to identify the carburetor, most of the later carbs are single MAB, measure all the "players", then look at what you've done with your engine and proceed with modifications in all areas, starting with the idle system.

The idle system is the BIG player in this deal, as it brings in the required fuel for you application.  No stock carburetors is going to fill that bill, especially when you've chosen a larger than factory cam on a 110LSA in a small block engine.

My book provides guidance for setting up the carb in all areas, starting with the idle system and main jet/rod requirements as well, all based on idle and main airbleed sizes.  I'd start there and educate yourself as to what is going on.  From what I can see so far in your responses, you are setting the rules for building the carb and no one is going to be able to help you out.  Idle system modifications are going to be required trying to use a late model emission calibrated carb on a modified engine build.  You can't just come along and throw jets and metering rods at it and come up with a good end result.....Cliff

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