Holley 0-80555C Model 4175 650 CFM Spread Bore 4-Barrel Vacuum Secondary Electric Choke New Carburetor Power valve blow-out protection adds trouble free operation Single feed fuel inlet with electric choke Dichromate finish with 4-barrels Includes vacuum for PCV, EGR, power brakes, distributor, air cleaner, and canister 100-percent wet-flow tested and calibrated for street drivability