The Julian date code March 7, was correct for the year of the car, leading me to believe it is the original carb. Shop with confidence. The setting procedures will be for a Quadrajet 4-barrel- but they are basically the same for the Rochester Dualjet 2-barrel as well, which is the primary side of a Q-jet carb, anyway. The following is with the carb disassembled. These days a lot of guys are restoring cars, not with crate engines and aftermarket Holley or Edelbrock carbs, but with antique drive trains using old-school fuel systems.
Rochester made carburetors from into the 's for many of the greatest cars - General Motors products like Chevies as well as Studebaker, Packard and others. To make restoring these great old cars easier, we've scanned in the entire Rochester carburetor service manual covering the years and we're presenting it here - for free.
The manual is in two formats - regular html pages with jpeg images of the scanned pages - and pdf files. You will also find detailed service manuals for specific Rochester carburetor types in downloadable ebook format. The Rochester carb manual changed format several times over the years, particularly in how information was grouped.
The QJet is a large 4 barrel carburetor that has a small primary side for fuel economy and good emissions and a large secondary side for good performance. QJets have a maximum airflow of from cfm. Because the secondary side of the Qjet opens according to the airflow requirements of the engine, the same basic carburetor size can be used on a large range of engine sizes.
For example, on a mild Chevy the air valve will never open all the way - because the motor can't use more than cfm or so.
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