The English materials scientist J. E. Gordon wrote an entertaining (at least for an engineer) book titled 'The New Science of Strong Materials'. It had a chapter subtitled (tongue in cheek) 'When all else fails use bigger nails'. To paraphrase Mr. Gordon, when all else fails use a bigger sledge. In this case, much safer than combustible liquids and less environmental impact. If the cylinder bore can be rehabilitated with just a touch up from a hone, it wasn't really stuck. You just were not persuading it with enough enthusiasm.
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