Broken exhaust manifold bolt CM870

[Chamberpains]

The dark black part is wet. The sooty black is dry. They're not soaked and the ports are dry. I have 6 the valves completely dry and the other 6 in different stages of wet half way down. I only posted 2 of the more wet ones.

I'm just curious is something I'll have to keep an eye on or is this par for the course on an ISX.