It couldn't be something as simple as the fan rotating in the wrong direction could it?
It just seem strange that all the people you had working on it, and all the work that was done, and it still overheats. This is a fairly common rig, and it had proven itself....well, all the other ones did:)
My first thought was that the radiator was plugged....or the sensors are failing (telling you it's overheating when it isn't really), but it seems as if they would have picked that up with a Dyno.
Now, I'm wondering if maybe there aren't a couple of coolant ports that were mis-drilled/cast, which are't allowing proper coolant flow past the cylinders, and they show the results when you get a certain load on the engine.
Did you get further up that mountain, before overheating, if you ran at a slower speed (less load)?
It certainly would appear to be an air flow or coolant issue, but I'm sorry, I don't know what to tell you....though the fan blade issue did come to mind.
Good luck in your search:)
