Safeer
Not too sure with this, but it seems that it's two bike engines joined together like Powertec do with the Suzuki Hayabusa engine. There's one clue that it was originally a bike engine is that the camshaft drive is at the centre. The bike's tank emblem shows it to be a Honda.
A bit of googling has made me think that it might be two Honda CBR1000F engines joined together. They had the centre cam drive.
As for the drive, a lot of longitudinal layout engines use this arrangement. All BMWs until the K1200 and their singles and parallel Twins, all Moto Guzzi's. The Honda Goldwing also runs the same arrangement. Vulcan, Virago etc...