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How to Rebuild and Modify Rochester Quadrajet Carburetors

Edelbrock Quadrajet Secondary Air Valve

The Edelbrock Performer RPM 850cfm Q-Jet has all the best Quadrajet features included in it right out of the box. One of those features is a properly set air valve opening angle that allows for maximum airflow and engine power output — which you can see being measured in the photo above.

Chapter 7 of How to Rebuild and Modify Rochester Quadrajet Carburetors covers the Edelbrock Performer RPM Quadrajet and all of its special features — including the kinds of improvements that can be made to the only performance-oriented mass-produced Q-Jet ever made. Edelbrock designed this monster to feed 450+ horsepower, large-displacement big blocks. It's also no longer in production, so you'll probably have to find one second hand and use Cliff Ruggles' advice in this book to rebuild it. Photo: Cliff Ruggles.

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