OEM Mercruiser Small Block Chev Exhaust Manfoilds with Risers. For 305 or 350 engines. Used, removed from boat 20 years ago, been in storage ever since. Very low hours, fresh water use. Dry joint set up for antifreeze (or engine coolant) and raw water discharge from risers. (set up for fresh water cooling) OEM Mercruiser Freshwater Cooling Hose Kit available as well, see separate ad.