Noo, that's the pre-chamber you see sticking out into the combustion chamber. The glow plug sits inside the pre-chamber.(sure looks like a glow plug no?)
$300. He said he would look at the casting, it is supposedly from a 91 300SDL.It's hard to see how deep those pits run. The combustion chamber to the left looks as if something was banging around in there, creating dents in the head. What # head is this? I'd want to clean it up and pop the valves out before committing to the sale. How much are they asking?