Yep, i cant find a thing out there about it, apart from
'the type number lists the specific carburettor, muffler, mechanics, govenor settings, etc. as well as the paint, decals and any specifics the machenary company that originally ordered the engine requested'
the only further detail i can get is that the last 2 digits (or letter) seperated after the space, are the trim number, for the decals & colour & such.