Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Stock 301 jetting

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17058263:
I took out my plugs and all are black. So I put in a 49k rod with a 73 jet will post how it works

Cliff Ruggles:
And trust me o power with 52p rods and it ran hot plugs wear bone white. But had a tan color on the rim of the plug. Total timing is 38.

With the APT at full height, a 52P metering rod would be around .042" in the jets, or very close to the 43K rod at a lower APT height in the same jet.

Are you running the APT thru it full range of adjustment with these jet and metering rod changes?

Also our 44 full tapered rods would have given you a broader range of adjustment that than the 43K rods in the same jets.

Increasing jet size is going to have it using more fuel, no other changes.  If it ran OK a while back with .070" main jets in it, install our full tapered rods with those jets and raise the APT till it runs the best at part throttle.

Also, make sure that you are using new jets with these changes, and that they are the correct jets, designed for Q-jet carburetors.......Cliff

17058263:
Ok took  it on the highway 40 miles each way got 18mpg. I adjusted my vacuum advance to 20 from 16 that made  differnce took less throtle on cruise. Apt 2.5 did use the 4bbl to pass a honda kick right in at 50 and  shifed at 4400.. 5 gall for 92 miles . With 73 jet 49 k rod .  Ch seconday rod.  L hanger.

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