You do understand that the only thing the piston stop is establishing is the correct position of your timing cover pointer at true top dead center.
So no, it makes no difference how far down the piston stop is, just as long as it contacts the piston.
Of course, for the purpose of finding the spot exactly between the two marks, you dou't want it too far down, the further down in the bore that the stop makes contact, the further your two marks will be apart from each other.
So no, it makes no difference how far down the piston stop is, just as long as it contacts the piston.
Of course, for the purpose of finding the spot exactly between the two marks, you dou't want it too far down, the further down in the bore that the stop makes contact, the further your two marks will be apart from each other.