The large diameter cap on the DUI Distributor could interfere with the standard air cleaner. To avoid using a smaller air filter system, the 14″ Offset Air Filter Base will allow you to retain the larger air cleaner by repositioning it away from the distributor. The offset base utilizes the standard 14″ air filter and top cover. The base is designed to work with most 4 barrel carburetors and is easy to install. Comes chrome plated for a durable finish and an attractive look.