Weber Marine 600 CFM 9661 is found on many Small block Mercruiser Engines. The part number 9661 is found on the front left foot of the carburetor where the manifold stud goes through. The carb has a square bore mounting pattern. This carburetor is completely remanufactured with new floats, needle and seats, accelerator pump and choke pull off. This carburetor uses a divorced style choke with a coil on the manifold and link that goes up to the carburetor. Link not included.