Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 726Get this manual
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SERVICE MANUAL NUMBER 24
Thru-Hull Mounted
aSeawater PickupSeawater Inlet SlotsMounting Screw Holes (If Equipped)Nut 1 Seal inside edges of 1-34 in(44 mm) hole in hull using suitabl