It's really hard to tell from the picture, and as someone suggested an acid dip or some other cleaning would probably help.
But is it possible that those are the remnants of a previous seal and it's just fossilized due to age?
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Re: Rebuilding difficulty Onan 131-0257 pump
--- The poster formerly known as Scrod ---
I want to live in Theory, everything works there.
1970 36C375