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Red Blooded American
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Foreign material in the cylinder? I've seen chunks of carbon build up come loose and destroy a plug before. If you had insufficient fuel pressure at speed and it went lean, it will start eating itself up as well.
 

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Foreign material in the cylinder? I've seen chunks of carbon build up come loose and destroy a plug before. If you had insufficient fuel pressure at speed and it went lean, it will start eating itself up as well.
I have a borescope coming later this week. But I suspect the heads will or should be pulled regardless. I looked in the plug hole and there was an obstruction, so naturally I poked it with a screw driver and it fell in the cylinder. Could the plug have grounded to the head and I sheared the tip off when I wrenched it out? It took a lot of force to get it out.
 

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Red Blooded American
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I'll step back and let the professionals jump in but there's no way I'd try to run that before pulling the head(s) and having a closer look.
 

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The plug has been severely hammered. Pull the head and check out what all damage there is. If the top of the piston shows damage too, pull it and inspect the ring lands.
 

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I have a borescope coming later this week. But I suspect the heads will or should be pulled regardless. I looked in the plug hole and there was an obstruction, so naturally I poked it with a screw driver and it fell in the cylinder. Could the plug have grounded to the head and I sheared the tip off when I wrenched it out? It took a lot of force to get it out.
Got a hunch that bore scope will reveal some carnage , pull the head (s) often times debris from a failure will trnsfer via the intke in final stages of failure
 

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What heads and are you sure the plugs are right for the application. The shinny aluminum color on the plugs show piston and the reach on the plug shows to deep of a reach. Lean could also enter in here. MLAO . Mark
 

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No need to wait for the borescope...pull the head. How do you have the water inlets and outlets plumbed? Is the water flowing thru the heads front to back?
 
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