1. Bob

    Rochester Carburetor CFM

    Rochester Quadra-Jet carburetors only came in two cfm ratings, 750 and 800. The difference is in the primary venturis. In the image, the left has the small 1-3/32-inch used in the 750 cfm carburetor. In the right, there is the larger 1-7/32-inch venturi found in the 800 cfm carburetor. You...