Choke: Manual. Engine/manifold vacuum is not related and has no effect on the operation of the carburetors secondary system. Secondary Type: Vacuum. Part Type: Carburetor. Carburetor Flange: Square bore.
600 CFM 4 Barrel Vacuum Secondary Carburetor w/ Manual Choke No Gaskets
Edelbrock Carburetor 1405; Performer 600 cfm 4 Barrel Manual Choke
1406 Carburetor Carb For Performer 600 CFM 4-Barrel with Electric Choke
Edelbrock Carburetor 1400; Performer 600 cfm 4 Barrel Electric Choke
1406 Carburetor Carb For Performer 600 CFM 4-Barrel Square Bore Electric Choke
Carburetor For 1406 Carb Performer 600 CFM 4-Barrel Square Bore Electric Choke