This is a used LIST 4412 Holley 2 two barrel carburetor that's been altered. It is a 500 CFM manual choke high performance carb center section. These are often used as the required carb for certain circle track racing classes and other racing applications. They are also used as a performance upgrade for vehicles with a smaller two barrel carb. The air horn is stamped LIST-4412-S and C01. This center carb has been altered (portion ground off), as seen in the photos. No base plate. All levers and choke assembly move freely. Fair condition - sold for parts. $35. Will ship!