Camshafts and Compression

Valman said
Plugs are mid grey, the ground strap has the annealed mark right around the bend. Maybe a bit closer to the threads.
No white, peppery marks on the plug or anything like that which would indicate detonating. But it does ping occasionally, as I pointed out.
It has NGK ‘7’ range plugs in it ATM.

You need to post a picture.

I’m deferring to Hysteric to read it because I don’t read plugs with your fuel. He does.

You could be rich, you could be lean. You fuel is different from our fuel and the plug reads differently.