1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 146Get this manual

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CYLINDER BORE SIZE Piston Size Standard Diameter .015 Oversize .030 Oversize Cylinder Block Finish Hone 3.375 in(85.725mm) 3.390 in(86.106mm) 3.405 in(86.487mm)

S If cylinder bore is tape

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