1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 117Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 117

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377 CID6.2L ENGINES
1 Clean gasket material and sealer from engine block and cylinder heads2 Inspect sealing surfaces for deep nicks and scratches3 Inspect for corrosion around cooling passages4