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Though I've seen the plugs installed both ways, I believe concave side out ) is correct. You want pressure building up from ice to push the plugs out. If the plugs were installed concave side facing the block (, pressure from the ice would tend to wedge the plug in more tightly against the...

Taking the front fender off is much easier than pulling the engine. I have never done freeze plugs myself, but I remember someone installing them in with a hammer and a socket from a socket set that was just smaller than the diameter of the plug.

Do you have enough space to drill a hole and use a slide hammer to get the plugs out? Remember that you also have to have enough room to hammer the new plug in.