what caused this

[scofflaw]

Check the part number on the plug, maybe wrong one, looks like a super extended tip

[rodbolt17]

they called them opti-pops for a reason. I have seen failures with under two hours.

[99yam40]

they called them opti-pops for a reason. I have seen failures with under two hours.

but what do you think caused this to happen to that spark plug?

[Operaman]

Check the part number on the plug, maybe wrong one, looks like a super extended tip

I was thinking that as well, looks real deep.

[walleye1]

They are the rite plugs 18 dollars a piece eridium plugs.

[robert graham]

What's an "opti-pop" plug?.....