VOLVO PENTA HOLLEY MARINE list # 80309 is found on Marine 350 ci engines. This is a dual feed, vacuum secondary 4bbl carburetor. Carb has electric choke and all non-stick gaskets. The Exact core return is required (List 80309). It also must have throttle head returned with the carburetor for a Core refund. This carb will be run on a live motor before it ships to ensure a smooth installation.