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After further reading, it seems the 3.5 EB prior to 2015 already had the reverse-flow cooling, and the 2.7 just followed suit. So the ecoboosts have already been like that it seems.
It's just hard to find photos of this. Anyone have a service manual for this year? The parts look the same as 2011-2014. Even the 2016 shares the same thermostat housing. I don't see a difference until 2017