Unlike the 645 series, the 710 is not offered from the factory as a Roots-blown model, but nothing in the basic design of that engine prevents such an offering. However, a pair of Roots blowers which would be required for a Roots-blown 710 series likely would be too large (too long) to fit in the available carbody space, and making a special carbody just for the very few likely to be ordered would be economically unsound. Therefore, any 710 engine using Roots blowers would need the blowers added to the engine after delivery.