Welcome aboard!
Under Documents of this site you can find a manual for you boat and it may tell you what thru hull is for the drain. You can try pushing an electricians fish tape from the thru hull in to see if you can clear the blockage.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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