1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 428Get this manual
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MANIFOLDS, ELBOWS AND RISERS
Torque Specifications LubricantsSealantsAdhesives Disassembly 7B-2 7B-2 7B-2 Cleaning and Inspection Installation Sterndrive Exhaust Extension 7B-3 7B-5 7B-6