Report two piece upper radiator hose in 1965-83 Avanti Posted January 30 · Edited January 30 by Randy Atkin Early Avanti II's came with an engine mounted surge tank. I am not sure when they stopped using them, but possibly yours is original. I know my '71 had one. Maybe others can comment on this. The two piece hose with metal tee and cap was offered as a conversion to replace tanks that had gone bad.