Uh Oh spark plug threads,,,

I have a barn find that the #4 plug has the threads farkled up, not good, probably caused by dirt or a beer can in hand while trying to thread plug. I dont know. Any ways It needs to be repaired, and done correctly. I know the best way would be to pull the head and freshen up the valve and seats, but my wallet advises otherwise. what would be the best plan of repair?

No eBay APP ID and/or Cert ID defined in Kunena configurationIf your lucky only the first few threads are borked in which case a reverse threading tool will sort it without having to disassemble.
They work a treat to clean crap out the threads and dont leave swarf in the cylinder.

Reverse Action Spark Plug Thread Chaser 14mm
• Specially designed to repair damaged spark plug threads on modern engines.
• Unique design allows the tool to be passed through the plug thread into the combustion chamber, then expanded to the correct size starting on the inner, undamaged threads.
• Traditional thread restorers rely on luck for the restored and undamaged threads to align.

I have used a kit like these, working perfect after years.

eshop.wurth.co.uk/Product-categories/Tim...3108.cgid/en/GB/GBP/

They guy you need advice from is Swest. He has chased a number 4 plug issue for a while. All good now, he’s got first hand experience

Key is not to let them get that bad. :whistle:
Steve