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How to Rebuild and Modify Rochester Quadrajet Carburetors

Finished Q-Jet

If you've followed along with the directions in How to Rebuild and Modify Rochester Quadrajet Carburetors and learned how to do some plating, your results should look a little something like this. Beautiful, no?

No, I didn't do the work pictured above and it isn't my Grandfather's Q-Jet. Based on what I've learned, that's probably a late model BOP (Buick/Olds/Pontiac) carb with an APT (adjustable part-throttle) screw. However, it could also be a mid-'70s Chevrolet big-block truck carb — I don't recall either its application or its numbers being mentioned and I don't know enough to be able to distinguish one from the other because both are supposedly front fuel inlet carbs. As Cliff Ruggles notes in the book, the front inlet Chevy Quadrajets are much rarer pieces, so just going by statistics, it's less likely to be the latter. You'd have to ask him, though, and he does offer carb advice and a number of Q-Jet services — including carb restoration and custom high-performance builds — as well as parts on his website at www.cliffshighperformance.com. Photo: Cliff Ruggles.

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