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Is there a trick to removing the 1/4" threaded drain plugs on the side of the block just above the oil pan? These have a hex socket end and I've already started to strip the hex. I've heard that these are installed with epoxy sealant so they don't leak but they seem impossible to loosen. Any advice?
I heartily second the suggestion of replacing them with radiator draincocks. Being brass, they won't corrode and get stuck like the plugs will and will make draining and flushing MUCH easier. There's a lot of old coolant left in the block on a "normal" drain if you don't drain the block through these ports.