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If the oil treatment is not working and the piston is going to be replaced, you can try a cold chisel and take the piston out in pieces. Reverting to a blow torch might do more harm than good. Another way to whack it with force is to use a 2x4 on the piston and a steel mallet on the other end of the 2x4. Be careful - too much force might kill the lower bearing and or the rod itself.

Unless the ring is embedded in the side wall of the bore, the oil treatment should work fine to free the piston given enough time. Thinking a little more about this - Is the piston cocked to one side in the bore??? If it is, you can try tapping the piston square again in the bore.

good luck and keep us posted...
 
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