Okay. I understand. Unfortunately that is a tough situation. However, just thinking ahead. Even if you get it out what is the repair going to be?
More than likely the head is going to have to be removed at this point. When you tried to cut the new threads, did you coat the tap in grease? If not then any shavings that were cut are now down in the engine.
If it were me, I would just cut my losses at this point and remove the head, remove the tap and then evaluate the condition of the threads because you may have to replace it. Then you can clean off the top of the piston of any metal shavings.
I attached the process below for the LH head. Please let me know if you have questions on this.
Thanks
Images (Click to make bigger)
Sunday, September 19th, 2021 AT 8:21 PM