Holley Carburetor Numerical Index
Holley carburetor numbers are preceded with the letter 'R' or the word 'List'. Numbers that start with other prefixes, such as '6R-' are not carburetor numbers - they only refer to a part of the carburetor. The term 'List' refers to the list of parts that goes into a particular carburetor. In many cases there are suffixes after the carburetor number; these use the same kit. The list below does not include the suffixes. Thus, list numbers such as R-120, R-120-1 and R-120-1A all use the same kit.