Geoff Your description fits huggy to the T. but huggy is a 4104.She has BIG injectors and runs like a top but I have never got easy with the heating problems.The radiator "#3# is as big as you can get in the side of a 04. Reaches from the expansion tank to belowthe side of the coach. Has a skid plate under. Also no room in front to put the charge air inter cooler in front of it that I want to tryHas a big flex fan and shroud. I have had the fan in the shroud,half in the shroud and all the way at the back of the shroud.could not tell the diff.The fan is belt driven off the end of the crank. has a smaller pulley on the fan sideAs soon as I get ready and round up all the parts a series 50 will be setting in the back of her.If I live that long, the list of things to do gets longer every dayI thought about replacing the large injectors but would have to pull the engine to do that might as well replace it at the same time."Someone" put the screws in the plate in the bulkhead in from the wrong side,have to pull the engine to get to the back head.The cradle that we used came from a Flex I think . It sets the engine at a 15 degree angle I think not laying down like everyone else doesuncle nedPS i also love the rts coaches. Looks like a race car of coaches. wonder what one would look like with a set of super singles on the rear.
Go to Staley Coach's web site and look at that little thirty five ft M C I motor home .