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A few hot cold cycles might just break the gunge up, sometimes it works sometimes it doesn't. Gas mark 5+ and let it soak up the head for 15-20mins then get it down to handlable temperature then hit it with a pipe freezer spray. If there's ever been any glue or thread lock used then heat is the best one to clear it.
In general you do need to be a bit more agressive with the heat cold than you think, found that in my landie days, stubborn nut? Hit it with the gas axe to a nice cherry colour and allow it to cool to black then crank it off.
You might also like to try some screw grab, awesome stuff if there is enough slot of any kind on a screw or hex head.
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"The final measure of any rider's skill is the inverse ratio of his preferred Traveling Speed to the number of bad scars on his body." Song of the sausage creature
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