Please excuse the quality of the pictures that follow. They are rather poor because I bought the cheap $89 borescope that doesn't capture pictures or video, so I used my iPhone to take a picture of the screen. The HF inspection camera that could take pictures and video was $199, about $110 more than I wanted to spend!
Anyway, only #8 shows any signs that the air cleaner stud may have gone into it. This is the underside of the head, and it appears like an imprint of the threaded air cleaner stud in the head adjacent to the valve seat. No discernible marks on the valve though, although difficult to determine with the borescope. And to be honest, the image on the borescope screen was much sharper than this image - I think I may have had the iPhone a little too close to the screen.
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