Allstar 14 inch Diameter 5-1/8 inch Flange Plain Aluminum Carburetor Air Cleaner Bottom has a 14 inches diameter with a 5-1/8 inches carburetor flange for a 4bbl carb. The design will not allow the use of hei style distributors. It is constructed from quality aluminum. It is a bottom only. The top and filter element are sold separately. It is backed by a 90-day limited factory . It is sold as one kit (less filter element).