If below the waterline, would it be too much of an expense to use bronze or stainless, so you don't have to worry about it later. I seen at least one nice boat on e-bay that sank from over tightening a thru-hull.
Like grace said 5200 or fastcure 5200 would do fine.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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