83, you'll have to pardon Al, they don't have freeze plugs on outboards.

If you look on the side of your engine block (can be in other locations too) you'll see a piece of metal (could be painted over) "sunk" into a boss. They are typically around 1 1/2" in diameter (varies widely), and look something like a frying pan without a handle. These are pressed into their bosses so that they can be pushed out in the event the coolant begins to freeze. The expanding "ice" should push out the plug, hopefully not crack the cast iron block. Emphasis on the hopefully.