Holley Carburetors. Mike Mavrigian

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       This carb (PN 1850) is an example from the 4160 series. It is a 4-barrel carb that has a single feed, a primary metering block with jets, one accelerator pump at the primary side, and a metering plate at the secondary side.

      The 1970s saw Holley’s continued dominance in racing with nearly every factory NHRA Super Stock/Pro Stock racer running Holleys. That hasn’t changed; Holley carbs have powered more drag racers than all other carbs combined. This era also witnessed the introduction of Holley aluminum intake manifolds, including the once-popular Z-Series developed in conjunction with Zora Arkus-Duntov.

      The 1980s marked Holley’s entrance into the fuel-injection market for which original-equipment EFI components and analog Pro-Jection retrofit fuel-injection systems for carbureted cars were introduced.

      In the 1990s Holley continued its new product introductions. The wildly popular HP Pro series of race-ready carburetors was introduced and has become the standard in racing. SysteMAX engine kits were introduced with matched cylinder heads, intakes, and cams. Also in the 1990s, the Dominator evolved into the HP Dominator, huge billet electric fuel pumps were introduced, and retrofit EFI kits evolved into digital Pro-Jection 4D and 4Di.

      Beginning in the 2000s, Holley introduced the popular Street Avenger, Truck Avenger, Street HP, and Ultra HP carburetors as well as billet mechanical fuel pumps and high-flow billet electric pumps. Although not covered in this book, Holley’s EFI systems have seen an enormous amount of change with the introduction of Avenger EFI, HP EFI, and Dominator EFI.

Holley ID System

      Two basic numbers are attributed to each Holley carburetor: the model/series number and the list/part number. The series number indicates the general type, or series; for instance, 4150, 4160, or 4500.

      The 4150 series is the original 4-barrel modular design, which features metering blocks and replaceable jets on both the primary and secondary sides. The 4150 series is available with either mechanical or vacuum secondary operation.

      The 4160 series is a slightly less-expensive variant of the 4150, featuring replaceable primary jets, but with a thin metering plate on the secondary side and no replaceable secondary jets.

      The 4500 series is the Dominator big-CFM racing series, with a larger main body and a unique secondary actuation linkage design.

      The model number is not stamped on the carburetor, but it’s easy to identify by simply examining the carburetor. If the secondary side has a metering block with jets, it’s a 4150; if not, it’s a 4160. The Dominator is easily identifiable by its size and the shape of the throttle bores.

      For all practical purposes, the “list” number is the part number of the carburetor; it is the top number stamped on the carb. The list number is also stamped on the choke housing/air horn of all Holley carburetors that have a choke housing. Keep in mind that the Dominator series and some other race carbs, such as the Ultra HP series, do not have a choke housing; their list number is stamped on the top of the main body.

       The list number (also called the part number) appears on the face of the choke housing on carbs that have chokes. The word “LIST” or the letter “L” sometimes precedes the part number; these were used randomly and have nothing to do with the year of manufacture.

       As seen in this example (a 4160-series 600-cfm carb), 1850 is the part number. Following the part number is –2, which indicates that this is the 12th update or change for this carb; this likely means that the dies have been renewed 12 times. For models that have been produced for decades, dies and tooling wear and necessitate updates in the manufacturing process.

       You don’t need to be concerned with the “dash” number. The bottom number is the build date. The first three numerals represent how many days from the start of a year that a carb was made, and the fourth numeral is the last digit of the year of manufacture. This carb was produced on the 133rd day of 1974, 1984, 1994, or 2004.

       This carburetor’s choke housing is stamped 80670-3, which indicates that this is a 670-cfm Street Avenger. The number shown below the part number indicates that it was built on the 160th day of a year ending in 4. Based on when this carb was purchased, this likely means 2014.

       This HP carb, because it has no choke housing, carries its identification on the side of the throttle body. It is clearly marked as a 4150. Note the “HP” designation under “4150.” Under the word LIST appears the list, or part, number of 82851, which indicates that it’s an 850-cfm Street HP carb. The build date of 0471 indicates that it was made on the 47th day of a year ending in 1. Based on when this carb was purchased, it was likely built in 2011.

       Street HP carbs have a vibratory polished body as well as smoothly contoured venturi inlets. All Holley carbs can be easily identified; simply use the part number stamped on the carb and search the database on Holley’s website.

       Carburetors such as the Dominator 4500 series do not have a choke housing, and as a result, the part number and date code are located on the side of the main throttle body.

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