Mercury Mercruiser - 3" Riser Kit - Closed Cooling - See Description for Application - 864929A4Raises the height of the GM V 6 & V 8 small block (non Electronic Control) engines with dry joint exhaust system to prevent water from entering the engine through the exhaust system. Maximum height of 6 inches (152 mm). 3 inches (76 mm) for CLOSED COLLING and dry joint exhaust manifolds. Fits the following models: 2004 2016 MerCruiser Marine V 6 & V 8 (305, 350, 377 cubic inch displacement) non Electronic Control engines (serial number 0W310000 and
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Mercury Mercruiser - 3" Riser Kit - Closed Cooling - See Description for Application - 864929A4