Is this internal engine component cracked?

Question

I was inspecting my engine (1.6L N15 Pulsar) yesterday and I noticed some moisture on the rocker cover coming from the oil fill cap. I unscrewed it and it looked like it was allowing some fluid out. I'm thinking the cap might need replacing.
I then had a look inside the oil fill and noticed what I think might be a crack in what I think might be part of the valve assembly?
My question is whether you guys believe that's a crack, what component has the crack and how I should go about it?

Edit
Something I forgot to mention is that the oil on the dipstick did have a few tiny bubbles in it which I haven't noticed before

blacksmith37 · Answer

That is the head; a part that holds a lifter. It is likely caused by a crack in the sand core and the molten metal conformed to it. It would likely cost most of the price of an engine to replace it if it bothers you. Best guess from the available view.

Answered by blacksmith37 on August 27, 2021

Is this internal engine component cracked?

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