Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

fuel mileage with 750 quadrajet

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shadetree55:
maybe dumb question but is there any way to make a 750 closer to a 650?  Running a bone stock 305 in my 55 with a 700R4 and don't want performance, need fuel mileage.

Mudsport96:
You will see better mpg with a 750 quadrajet than you would with a 650 holley or edelbrock. Just tune the primary side correctly for your application and you will be fine.

shadetree55:
I've only got 250 miles on new crate motor and the carb I rebuilt with I'm assuming is stock jets and metering rods for the primaries. I bought it used and it had already been rebuilt by Holley, had a tag on it stating so.I went ahead and rebuilt it myself just to be sure everything was clean and good.  I'll pull it after I get some more miles on it and see what size the primaries are. I don't want to lean it out much. It performs well for my driving needs.

77cruiser:
If it's been rebuilt by Holley you won't get very good mileage, I think they butcher them.
Find a unmolested one & rebuild that.
What do you get for MPG now?

Mudsport96:
Also, knowing the rest of the setup can help us help you.

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