Posted a question one time about whether or not V10's were ever offered/proposed for the Expedition and got two types of responses. No, not done. Why would I ask since there's no room for one anyway. Not saying there is room, but I happened to have my phone in my pocket when I had the hood up the other day. Took some pictures to show the distance/opening between the front of the engine and the electric fans behind the radiator. Compared to other cars/trucks I have it seems to be a lot of space.