Holley 600 cfm 4150 Series Mechanical Secondary Brawler Carby # BR-67254Holley 600 cfm 4150 Series Mechanical Secondary Brawler Carby # BR 67254 CFM: 600 Fuel: Gasoline New or Remanufactured: New Number of Barrels: 4 Carburetor Flange: Square bore Choke: Electric Secondary Type: Mechanical Fuel Inlet: Dual Primary Jet Size: 66 Primary Power Valve (Hg): 6. 5 Hg Primary Discharge Nozzle Size (in): 0. 028 in. Secondary Jet Size: 72 Primary Outer Air Bleed Sizes Included: 70 Primary Inner Air Bleed Sizes Included: 31