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Old 06-01-2005, 02:00 PM
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Need help with Edelbrock carb


My 350 that was built by the previous owner on my '72 C10 is acting like it is starved for fuel a bit. It has a mild cam, headers, new starter/fuel pump/HEI ignition. I can see it has a Performer RPM manifold, Performer carb, carb riser, velocity stack, and a 10" round air cleaner with a K&N filter.

I looked into the carb it has and it is an Edelbrock 1406 600 CFM carb with electric choke. I read on Edelbrock's web site that they don't recommend the 1406 to be used with a Performer RPM manifold and that it is calibrated 2% leaner than a 1405 carb (their other 600 CFM carb with manual choke).

My question is (and I don't know much about carbs so this might be a dumb question) can I change the jets, metering rods, and step-up spring on my 1406 to match the 1405 to richen it up a bit and get the truck to run better?

The specs on the 1406 are: Metering Jets – Primary .098, Secondary .095; Metering Rods – .075 x .047; Step-Up Spring – yellow (4" Hg).

The specs on the 1405 are: Metering Jets – Primary .100, Secondary .095; Metering Rods – .070 x .047; Step-Up Spring – orange (5" Hg).

So I wouldn't need to change that much. I am just trying to get away with doing this cheaply and not buying a new carb. I already changed out the fuel filter and the fuel pump is an Edelbrock so I am sure it is pumping enough.

Any help is appreciated!

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Old 06-01-2005, 02:24 PM
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In the back pages of the carb manual are the calibration charts which you can use to figure out with metering rods and/or jets to get to go rich/lean 1,2,3 steps. If you don't have the manual, you can download it off the Edelbrock web site.

Changing the metering rods and springs is very easy and quick to do. Changing the jets involves removing the airhorn (8 screws I think) and that's not too hard either.

You can either use the charts to figure out the part #'s to try, or order the calibration kit. You might want to get an airhorn gasket or 2 if you are going to change the jets.
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