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How to Rebuild and Modify Rochester Quadrajet Carburetors

Early Q-Jet

This is an example of an early Rochester Quadrajet; that is, a Q-Jet prior to 1969 when the first significant changes were made to the original 4M design; specifically, this carb is a Pontiac unit from 1966.

Chapter 1 of How to Rebuild and Modify Rochester Quadrajet Carburetors focuses on the history of the Rochester Quadrajet and its changes throughout its 22-year production — which began in 1965.

You'll find tidbits like this, as well as the many changes, adaptations, and upgrades throughout this chapter — even how to decipher this carburetor's 7026260 part number. Photo: Cliff Ruggles.

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