1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 156Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 156

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377 CID6.2L ENGINES
1 Remove torsional damper, oil pan and timing chain cover2 Turn crankshaft until timing marks on crankshaft and camshaft sprockets are in alignment

aTiming Marks