Head gasket failure
I have a CSL here with a blown head gasket. Caught this one very early, you can see it's only gone through 1 layer of the head gasket. I've never seen one like this before, it's usually gone through all 3 layers.
Smooth running values were perfect, only a cylinder leakage test showed an issue. a leakage of 12%-14% was measured, with the leaking air heard and felt down the spark plug hole of the adjoining cylinder.
Given we've caught this early I'm hopeful there won't be any issues with the big end shells. The block and head are also still in perfect condition.
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