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Adding this here for magnesium case owners - upon removing my head studs that were installed by a builder in Massachusetts in 1991, I noted a bead of silicon sealant around the outside of each hole at the top. Given the talk of head studs pulling on the magnesium case, I expect this was applied to the top 3-4 threads (toward the middle, not the tip) of the stud where it threads into the case in order to prevent moisture from entering and subsequent corrosion to the loaded area/case threads. I've fitted my new headstuds using permatex ultra black in the same manner...makes sense to me.
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“Of the value traps, the most widespread and pernicious is value rigidity. This is an inability to revalue what one sees because of commitment to previous values. In motorcycle maintenance, you MUST rediscover what you do as you go. Rigid values makes this impossible.”
― Robert M. Pirsig, Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values
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