Holley Alcohol Jet 122-148 | Holley alcohol jets are specially designed to work only with the following Model 4150 HP carburetors: 0-80542 (650 CFM), 0-80535 (750 CFM) and 0-80498 (950 CFM). The unique metering blocks used with these carburetors are designed to accept the physically larger size of this main jet. 2 jets per package.