I was pretty sure the 354's were all Black and the older one's were red....not to mention....I thought they were N.A. where 354's were turboedIJ....could be wrong. If it's a true 354 it's called an AT6 3544....depending of whether or not you have aftercooling and turbo. Why you would want to put a perkins in a motorhome is beyond me.....those are the most vibrating shakiest diesels I've ever been around. Parts are higher than most.....Cav's pump system is pretty competitive for longevitiy and are relatively simple to work on...(Can't beat thier injectors for setting pop off pressure....slick as a whistle to do) But the rest of the engine.....Well, Perkins is known far and wide for their black smoke trademark and I've just not ever really been impressed with the horsepower of them. JMHO of course though.