Carburetor - HOLLEY 4180-C 4-Bbl: Identification
A carburetor identification tag is attached to the carburetor. The tag contains part number prefix and suffix. Basic part number for all carburetors is 9510. A design change code (if any) is also stamped on the tag. An assembly date code (year, month and day) is also stamped on the tag. See Fig 1 .