Thanks for all the input, I couldn’t hear it as much as smell it extremely well. The sound kind of transferred.
But definitely not there on the other cylinders like that.
Yeah I was puzzled at the compression compared to the leak down…
I think the borescope was just because I have it take a look but may may not prove anything to me I know.
Problem is it runs good but it says what it says.

Now could there be something holding a valve open that stays in the way even bumping it over while we did the leak down?
Makes me wanna do u pull and see what it shows after.. unless you all say don’t bother and pull the head…