The "WOW" video is interesting. I take it that the buggy is fitted with the 6.9 engine, and whilst I don't know the reason for the engine "expiring", I am not really surprised. Having a good look at the pictures of the finished engine with its various modifications, I couldn't help but be impressed with the extent of modifications carried out.
Where I started to get a bit shaky, was when I listened to the running of the engine. I realize that the motor was running in a confined space, but there was just something that didn't sound right when it was running.It sounded like a hydraulic lifter problem, but it also "hammered" as if there was a camshaft or follower problem. Have another listen. It just does not sound 'nice'. Only my opinion - any others in agreement ? Regards Styria