That plug is pretty old now and I have run it quite a bit.

I guess I have been running too hot though, eh? I figured I would run on the edge of risk and would learn for myself where the dropoff was.... looks like I did

Oh well, that's the fun of it eh.

There is a shim, I just took it off to wipe it down a bit... sorry for the confusion I created there.

So I was running to lean in general then - or is it possible a plug will look like that over time anyway if I use the same one over and over. If it's blown like that is the engine probably dead then?

Thanks for the help guys