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Owns A Torsen
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https://ford-rangers.com/forum45/2176-1.html
You know half the nation thinks that these were put there to pop out if the anti-freeze gets too lean to somehow save the head/block from cracking.
They are actually part of the casting process for removing the sand after the iron is poured. They machine them while the head is on the mill and seal the holes with extreme press fit core plugs. The thinness of the core plugs is why they tend to rust quicker than the thick casting.
If this is of interest to anyone do a search on "cope and drag" it will explain the mold process. I designed a couple sand molds back in the day.
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