1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 150Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 150

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377 CID6.2L ENGINES
IMPORTANT: Cylinder bores must be clean before piston installationClean with light honing, as necessaryThen clean with hot water and detergent washAfter cleaning, swab bores