Yeah thought so.
I have some important issues on the rings, after the leakdown test. I know for sure at least one ring was tired for the past many years. Certainly died on that dyno in August (guy was pretty rude running it 3 times at 17AFR up to 4k with smoke) and some others got affected.
I wouldn't be surprised to have leaks around valve stuffs as well. I will remove the manifold this w-e if I have enough clearance, I'll see a bit better.

But I need to get the head off anyway and that will really tell what's next.