tbranch21 welcome aboard
What O/D do you have and Alpha or Bravo? Sounds like Bravo from from what you have described.
So if you put a hose to the input of the raw water pump it is OK, correct? My first thought is either the water pick up in the outdrive is clogged.
IMO scoring will not result in that much of a suction loss but instead tear up the impeller faster. How worn did dthe old impeller look?
BTY: just google merc raw water pump to find sources.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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