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This has been disassembled and the diaphragm has been inspected internally
Exhaust cover plate 203172
Equivalent Part Number:
The Part number for oil pan is 71938 / 71938A2 ---- Found on all "470" models 1976-1989
MerCruiser Freshwater Closed Cooling Kit Heat Exchanger Mount Bracket 74632A1 Intake Manifolds This has been disassembled andItem Details MerCruiser Mounting Bracket Set Pair for Freshwater Closed Cooling Heat Exchanger (Port Left & Starboard Right) Original Paint Foam Pads should probably be replaced, but pretty much any 3M sticky foam product should work for this. Part Numbers Included 74633A1 74633 (Port) Mounting Bracket 74632A1 74632 (Starboard) Mounting Bracket Compatibility MerCruiser Chevy GM 305 5. 0L 228hp 898 V8 1981 1983 Using a closed cooling kit (74643A1)