The Base Assembly is really the only part that is different for example between a 250 engine and a 235. It has to do with the spacing between the two mounting flange bolts. Never toss a Rochester B carb that has the wrong mounting bolt pattern. Thats ALL the problem is. Get the correct one and the rest of the carb is good.
The carburetor bolt pattern will work for a Stromberg WW or a small base Rochester 2G. The kit includes: Mounting plate, three 1" carb risers, six gaskets, and stainless steel bolts. Blower case is not included. 6V53 Adapter Tri Power Blower Supercharger Small Rochester 2G Carburetor 6v-53
Details about Rochester 2G 2GC 2bbl Weber Carb Conversion kit 55-85 fits AMC Chevrolet Buick Fits small base 2G 2GC Rochester bolt pattern w/cable.
This will be the easiest to mount, as the 2-15/16” 2-bolt base flange bolt pattern has a smaller “footprint” than a 2 bbl., but jetting advice is harder to come by. Low accelerator pump volume may be a problem. “Rochester Carburetors” by Doug Roe is a complete guide to jetting and adjustment here: . Let’s compare the Monojet “M ...
The “Holley” pattern is 5 1/8 inch by 5 5/8 inch. Comparing this pattern to the AFB pattern, one will note the front-to-rear dimension is the same 5 5/8 inch, but the side-to-side dimension 5 1/8 inch is wider. This pattern was used from 1957 at least through the 1974 model year for some square bore carburetors.
Find Carburetor Adapters with Rochester small 2-barrel Carburetor Flange (application) and get Free Shipping on Orders Over $99 at Summit Racing!
These open base gaskets are for both the Holley 2300 series and Rochester 2G "small base" 2 barrel carburetors.Smaller bolt pattern: 1-7/8" x 3-1/4" Larger bolt pattern: 3-1/2" x 5-1/8"