Raises 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 MerCruiser Marine V-8 (305, 350 & 377 cubic inch displacement ) non-Electronic Control engines (serial number 0M600000-0M614999).