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We have tended to use a thread chaser to clean cases rather than a tap.
We check the stud threads with a 6H gauge and rarely find a problem but it can be tricky to install new studs with this fit as you need to be quite fast to stop the Loctite setting.
The forming tap is an interesting idea do you know the class of fit after using a forming tap? I would guess that this will open the thread slightly and increase clearance which may make it easier to install the stud.
I have never tried to fit studs without Loctite and I would worry that they could move and bottom when the cylinder head nuts were tightened
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