Brand New Holley Quick Fuel 750 CFM Brawler Race Carburetor, Red Billet & Black Finish, Mechanical Secondaries, Compatible with 4150 Models (Holley Part #BR-67331) NOTE: This model of carburetor has the square bore flange bolt pattern. Replaces Holley, Edelbrock, Carter AFB & Autolite style carburetors with 5 3/16" x 5 5/8" bolt pattern. Spreadbore style intake manifolds need an adapter to install this carburetor. Similar to Mr. Gasket #1932. Features: The latest technology in air/fuel calibrations for street or race engine demands Mechanical secondaries Dual inlet fuel bowls with sight glass windows for safe & easy float adjustments Changeable idle & high speed air bleeds for easy tuning along with 4-corner idle adjustment Performance models include billet metering blocks & throttle bodies with precision throttle shafts to ensure long term performance Black coated finish for corrosion protection & good looks Specs: Barrels: 4 Billet Color: Red Booster: Down Leg CFM: 750 Choke: None Circuit: 2 Finish: Black Fuel: Gas Fuel Inlet: Dual Fuel System: Carbureted High Speed Air Bleed: 33 Idle Air Bleed Size: 70;70 Marine Use: No Material: Aluminum Model: Brawler Race Primary Main Jet: 74 Primary Power Valve: 4.5 Primary Pump Nozzle Size: 31 Primary Venturii Size: 1.380" Product Type: Carburetor Secondaries: Mechanical Secondary Main Jet: 84 Secondary Venturii Size: 1.380" Supercharged Application: No Throttle Bore: 1-11/16"