Strange piston damage

[CrazyPrime]

What would cause this piston damage and would it require replacement? It was in a m20b25 with 150xxx miles.

Head is similar but not as bad.

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[Coupelx]

Id say it ate something at some point in its life. as long as it didnt pinch the ring groove you could run it.

[jeffnhiscars]

Perhaps a broken spark plug tip bouncing around

[CrazyPrime]

Ring seats are perfect damage is localized to that one area on piston and head.

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[digger]

Need to smooth the edge looks like it's being dinged up and sticking out the side

[AndrewBird]

Considering how plentiful used, good condition M20 piston are, I would just pick up a used one and not run that one.

[mr2peak]

How's the block?

[CrazyPrime]

Block has zero damage.

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[Northern]

looks like it ate something and it got squished into the head/piston at TDC