1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 329Get this manual
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Air Horn Assembly'" Pl ug, air horn Spring inlet Gasket Gasket Nut Gasket Inlet NeedleSe Ass'y Main Well Support Ass'y Screw, main well support to air horn Jet, main well support Power Valve Ass'y Scr