draining of engine

As you all are aware i was able to finally get my hands on a used engine thats in the can, i notice a few weeks ago while looking it over the drain cock on the right side and decided to open it, clear water ran out, well tonite were supposed to have temps in the 20's and well i went ahead and opened the drain cock to drain the water, i know these engines are heavy and thick but did i do the smart thing or would it have been okay to have left it alone, if you have a direct answer just send me a pm as im sort of worried, i know now that it won't freeze in the engine but i was curious if i did the right thing or if was worried for nothing.

I dont know how cold it gets where you live, but draining the water out has to be the smart move for starters.<img src="emoticons/icon_smile_approve.gif" alt="Approve">

Thanks LD,
Yeah i live up here in the mountains of Va, near the western part of NC, it gets cold!!! plain and simple. I guess i did the right thing then, i just happened to remember that and opened that drain earlier tonite...
Its in the 20's right now, but i have seen it get well in to the minus degrees, the worst was around 45 below and that was without the stinking wind.