Quote:
Originally Posted by Blackbirdws6
Piece of the intake maybe from machining or w/e likely got in the cylinder and jumped around. Prob got mashed around quite a bit before either getting destroyed or exiting the exhaust valve. Prob only took a moment for that to happen.
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Yeah, I'm no pro builder but this really looks like a piece of debris, maybe something stuck in the intake somewhere. I dunno if detonation of any kind will make identically shaped lines like that.