that'd be a PD4104 - no gas engines in GM coaches, originally be a 6-71 diesel, in need of updating, and
awkward to work on , but a good candidate for running on waste veg oil ... if it had factory AC it'd have a 2nd 4something diesel to run that ... they had a manual 4 speed trans ... 35' long .... they made maybe 5000 of them over a number of years, very expensive upkeep, but if you can get it for cheeep, fun stuff ... better quality than the GM PD4501, Greyhound Scenicruiser
Bill
