The serial numbers were all hand engraved. I have a 750F and the tail cone is different...a bit shorter and not as tapered. Hook up should be the same if you are sure there is not
a seperate oil tank to provide lubrication. I'm not sure at what point RAM switched to fuel/oil lubrication. Great engines though, the sound of an air start turbine is not to be missed!

I will mention one other thing about these engines. Once the engine has ramped up and is running you will usually see some white smoke at the GSU. This is normal as the engine
expels propane and unburnt fuel back through the gas line. The first time I started mine, I freaked out and thought the whole thing was going to blow!