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Not knocking you BamBAm, but the thread pitch cannot change. If that were the case you would have to heli-coil your head.
Heli-coil;--- Drill out sleeve and tap new thread
The only things different headstuds can offer are; higher tensile strength and different fatigue properties. and maybee corosion resistance, but I dont see corosion being a factor.
Sorry to piss in your corn flakes.
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