When I install studs (which hold the manifold) into my replacement head, do I seal them with something. I noticed that the holes go all the way into the cavity in the head (coolant cavity??). Do I use high strength thread lock, or silicone, or something else??

Thanks

Mark

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1984 300TD Wagon, 407,800 mi (current daily driver)
1985 300DT Sedan, 330,000 mi (gone to that great autobahn in the sky)