I've seen it listed as 1-5-4-8-3-7-2-6, following the diagram of the crank given HERE and the explanation given HERE under B, would the firing order not be 1-8-3-6-4-5-2-7?
The current firing order loads the same crank pin just 90º apart, for example 1-5 would fire opposite bank, but same crank pin. This would lead to torsion issues (hence their vibration issues with the exhaust headers), and put unnecessary work on the oil system.
EDIT: They're current firing order looks a lot like Ferrari's v8 firing order 1-5-3-7-4-8-2-6... its almost as though they went to the wikipedia for "firing order" saw that Ferrari's was listed as flat plane, figured they wouldn't copy it and swapped two pairs... All without realizing that Ferrari uses a different cylinder numbering convention.
TL;DR: Ford done fucked up... I think...
EDIT 2: the first diagram is incorrect, ford uses and up-down-up-down so the point about flipping 3-7 and 4-8 makes more sense. The correct crank pin numbering is still the same, but the pins are in different orientations cylinders 1 and 5 are still sharing a crank pin.
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