Just thought I would pass on some issue I had today when I heat cycled oddzilla #1.
If you look close at the photo you will see that the top end of the sparkplug unscrewed and fell into the plug well when I lifted the high tension lead off the plug.
Noticed it when I shut machine down and plug lead was high on plug.
I now Loctite all of the sparkplug tops.
It didn't sputter or miss but it might be and issue. Just thought I would pass it on.