I have spent a lot of time searching on Google and every link I can find, but not finding much. The NHH 220, NHH250, NHH195 and NHHT 220 seem to all be of the same family of the NHC 250 that is found in the White Freightliner SD/DD kit. However, the second H I believe means "Horizontal" as this engine was used in buses with a flat floor and the engine was laid on its side. I have only found one good picture of it. Does anyone have any more pictures or info? I plan to put this in my Frageol/Road