Does this look like a problem (exhaust valve)?

[rv6n6r]

I got this harbor freight borescope which is less than ideal, hard to get good resolution but here is what I'm seeing on #1 exhaust valve. Does this look like a crack? What else could cause a "feature" like this? I have the exhaust off so I can see the back side too, can't see anything there but it's probably too encrusted to be able to tell if there were.

 

[az_gila]

Could you have possibly scraped it with the end of the borescope?

 

[rv6n6r]

Could you have possibly scraped it with the end of the borescope?

That's a possibility although it seems like I have enough trouble just getting the thing to bend around far enough to look at the valve with the 45degree mirror. But who knows, it's not out of the question. I'll probably run it and check it again, if it goes away then I'll be pretty confident there's no crack. Honestly if there were a crack more than halfway across the face of a valve it seems like it would break pretty fast instead of hanging on just long enough for me to see it during an annual.

But in the meantime, any other insights would be welcome!