1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 904Get this manual
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ModEn gine Horsepowe r)
25" 23" 23" 21" 21" 19" 19" 17" 17" IS" IS" 13" 13" II" II"
140 (6 Cy I)
13" 13" 13" 13" 13" 13" 131311314" 14" 14" 14" 14" 16" 14" IS"