Holley 0-80803HB Ultra HP Hard Core Gray Aluminum Carburetor Designed For Race Engines; Ultra HP Carburetor; 750 CFM; Model 4150; Double Accelerator Pump; Hard Core Gray Aluminum with Black Billet; Not Legal For Sale or Use In California Billet Aluminum Metering Blocks With Changeable Emulsion Bleeds Billet Aluminum Base Plate For Strength Glass Sight Windows For Quick Fuel Adjust