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Drain plugs on the block should be the same as all the other big blocks. If they've never been out, good luck with that. Are you trying to winterize it? I usually just pull the hoses when the engine is hot and what little is left will evaporate out. Besides, there's not enough left to hurt the block even if you did live in a very cold climate but if you are trying to get them out for other reasons, try it when the engine is hot. It's usually easier that way.
They're 1/4NPT threads and can be a real bear to remove. I always replace them with brass petcocks for easy draining and no need for special tools of big biceps....
Thanks, guys. I bought the car last June and want to put fresh coolant in it. Based on the above, I'll do as Cranky suggests. I'm not interested in doing battle with drain plugs.