Mercury Mercruiser GM V-8 305 CID / 350 CID Engines Service Manual., Page 785Get this manual
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MANIFOLDS, ELBOWS AND RISERS
Elbows With Risers Elbows Without RisersExhaust ElbowSlot Gasketin(76 mm) Exhaust Riserin(152 mm) Exhaust RiserNut (8)Stud (8) 9-38 in(238 mm)Stud (8) 10-38 i