Rochester 2 Barrel Carbs

[jhughes76]

Does anyone know a website, or possibly a good book, which gives good information about identifying Rochester 2 barrel carbs? I am particularly interested in finding the ones which will work with the 3x2 intakes. I have noticed that a lot 3x2 intakes call for a small flange and side fuel feed, but does that mean that all GM Rochester 2 barrels that GM used in the 70s and are in junkyards for a dime-a-dozen will work if they have those two features? I know a good bit about Strombergs, but my knowlede about Rochesters is minimum other than that there are small flange, large flange(2GC), and the ones made for factory tri-power setups(I think that's right). I really just need some info for when I am looking around at swap meets. Any advice would be appreciated.

[carbking]

Rochester carburetors produced prior to the 1968 model year are easily identified by tag only. The Clean Air Act 1966 Amendment (covering automobile emissions) took effect with the 1968 model year. As the carburetor is considered to be a part of the emissions system, it became necessary for positive identification, in order to be able to detect "tampering". Thus 1968 and newer Rochesters are "roll stamped" with the identification number. The 2 barrels carbs are stamped horizontally on the bowl (center section) on the side opposite the throttle arm.

Positive identification of Rochesters built prior to 1968 is very difficult at best if the tag is missing. One item to look for is that factory tripower END carburetors would have no idle mixture control screws, and the throttle body would not be machined for idle mixture control screws.

Jon.