Spark Plug Blown Out?

[Idaho Red Rocket 3]

That sound good. Go for it. Kep us postd plase.

 

[Gerald]

Was there any lasting damage? I used the borescope and the threads look a little rough but intact. As my abilities improve I'll see if I can take some useful pics tomorrow. I'm reluctant to run a thread cleaner down them in case I drop swarf into the chamber though, so after all this talk I'll probably end up doing what Atomsplitter suggested - fit new plugs - if they hold the torque then run it and hope. The pressure gauge fitting screwed in easily and held the pressure, so there is hope......

If you get the right thread chaser, you can put grease between the flutes and it usually holds the shavings, shouldn't be too much material if any.