Mercury Mercruiser - 3" Riser Kit - 2002-2004 MCM V-6 & V-8 non-EC - Standard Cooling - 864929A1Raises 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 STANDARD COOLING and dry joint exhaust manifolds. Fits 2002 2004 MerCruiser Marine V 6 & V 8 (305, 350 & 377 Cubic Inch Displacement) non Electronic Control engines (serial number 0M615000 0W309999).