Compression test results

[dadsgreentruck]

I did a valve adjustment and a compression test today. I have a strange ticking noise going on that I thought was an exhaust leak, but after changing the manifold gaskets and exhaust donuts it didn't go away so now I'm at a loss as to what it could be. It seems to be coming from the general area of #1 cylinder, but it's hard to localize. I thought it might be a bit of valve clatter but the noise remains after adjusting them. My compression test looks a little odd though, I think...

#1 - 150 first two tests, then I came back to it at the end and it was 130.
#2 - 130
#3 - 130
#4 - 130
#5 - 130
#6 - 130
#7 - 120
#8 - 110

I did each cylinder 2-3 times to make sure I was getting a consistent result (engine warm, by the way).

Spark plugs look pretty much identical; black carbon base with tan insulator and electrode, except for #7 and #8 which are somewhat darker.

Any thoughts on where to go from here?