Revised Jet Sizes

7.4 Litre Holley Carbureted Engines

Due to fuel calibration changes, primary and secondary jet sizes listed in older service manuals require updating.

Identify which model Holley carburetor you are working on. Locate the Holley list number "a" stamped on the carburetor. Refer to the information below for the updated primary and secondary jet sizes.

Please make a note in the appropriate service manual sections and parts catalogs to refer to this bulletin when selecting jets for service.

List Number Jet Sizes

80378 59 primary, 72 secondary
80378-1 56 primary, 73 secondary
80378-2 73 primary, 73 secondary


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