I'm in the process of cleaning up my pistons from naturally aspirated 98 block with mechanical Injection pump. Noticing what appears to be some melting on pistons 8, 6 and 5 I attached a picture of #8 because it seems to be the worst one. Any ideas about the cause of this damage? I was hoping to re use the pistons with new rings if they are in spec but I guess I will replace these three.
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