440 Piston question

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midnight340

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I have a friend who's building a 440 out of a truck, to go in a Chrysler 300.

...and he's asking about what caused this. I assume detonation??? Would anything else cause this?
 
Thanks... he said the damage is not very deep. It was out of a mid '60's Dodge pickup, somebody's project, so don't know any history. All 8 pistons were like this. May never know.
 
looks like pre-ignition or detonation marks to me, typical clean area in the pattern.
 
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