Edelbrock 1405 Performer 600 CFM Square Bore 4-Barrel Air Valve Secondary Manual Choke New Carburetor Primary venturi booster is a bottom feed design for smoother acceleration and better drivability Single feed fuel inlet with air valve secondary type Shiny silver finish and calibrated for gasoline Manual choke with 4-barrel square bore carburetor flange Backed by Edelbrock's exclusive 90 day warranty