It’s Back! Brand New Holley 660 Center Squirter 4224 AC. This is an all aluminum carburetor. Main body Fuel Bowls , metering block and solid billet baseplate. This carb is fully adjustable with screw in air bleeds and idle feed restriction. The carburetor also features innovative annular discharge boosters and a secondary jet plate with removable jets. The air cleaner bridge comes on the carburetor and each carb is test run on a live motor before it ships. For Tunnel ram applications these can sit in line and do not need to be sideways.