1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 404Get this manual

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SEAWATER COOLING SYSTEM
aSeawater PickupSeawater Inlet SlotsMounting Screw Holes (If Equipped)Nut

1 Seal inside edges of 1-34 in(44 mm) hole in hull using suitable sealer2 Apply mar

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