1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 166Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 166

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377 CID6.2L ENGINES

IMPORTANT: Oil by-pass valve and adaptor assembly should be inspected whenever engine is disassembled for major repair or whenever inadequate oil filtration is suspect