Head Gasket Preference

I think the larger bore would cover all possible options with room to spare. Like a 340 that someone has bored .060. or maybe an x block. Not totally ideal because of the crevice can hold combustion gases that can go unburned and this alters compression slightly. This way the manufacturer does not have to worry about having a bore on their gasket that is too small. Obviously the custom bore gaskets would be for custom builds or racing application where this kind of detail is appreciated. Still. on most applications, a 4.180 bore would not be needed. {look at the price, of the two.} so, it boils down to cost I think.