Okay, so I managed to get som poor quality pictures of the piston. I don't see any "indent/marks" on it, but it seems to be some sort of metal balls or something. Guess I'll have to pull the head off anyways. Looks like some sort of hair on top of the piston as well, don't know how or why.
Is this what it will look like when the piston comes in contact with the valve? I can try take some better pictures if wanted, but quality is gonna be limited by my cheap camera
Edit: Forgot to share link to pictures.
https://imgur.com/a/6v1rBym