1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 907Get this manual
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Mod el (E ngin Horsepower)
B-48-57271 Al B-48-57269A1 B-48-57267 B-48 -57265 B-48-57263A1 B-48.3305A B-48.3303A B48 -5472 1 Al B48 -54719A B-4S -54717 Al
29" 27"" 25" 23" 21"