Trying to remove a barrel with the worst stuck piston I've ever come across. Been soaking with Kroil for the last 5 days, beating with a plastic deadblow hammer and heating with a propane torch. Then I started hitting it with a 2 pound brass mallet. Can't really get a cylinder very hot with propane. I'm wondering if I can safely use acetylene torch and rosebud tip? The cylinder is already .060" over, but otherwise in great shape, so I don't want to risk damaging it. Apparently the engine has been partially dismantled in the past, as there were no timing gears when I removed the cover. The inside case nut is loose, and I can raise the barrels so I can get it off and split the cases, I think, but I'm not sure that would make it any easier. No need to be in a hurry, so I can just continue soaking and maybe it'll loosen up eventually. What say the wiser, more experienced?