Holley 0-80870 Street Avenger 870 CFM Four Barrel Vacuum Secondary Electric Choke Carburetor Adjustable vacuum secondary to tune for fuel economy or acceleration Electric choke, easy to adjust and designed to prevent accidental over-adjustment Adjustable needle and seat design to accommodate varying fuel pressure levels Clear sight plugs to initially set fuel level without the risk of spilling fuel Power Valve with million mile blowout protection