Holley 0-80770 Street Avenger 770 CFM Square Bore 4-Barrel Vacuum Secondary Electric Choke Carburetor Needle and seat design eliminates external float level adjustment Dual feed fuel inlet with vacuum secondary type Silver finish with built-in secondary fuel filters Includes vacuum for PCV, EGR, power brakes, distributor, air cleaner, and canister Power valve blow-out protection adds trouble free operation