I checked the oil as soon as I pulled off the freeway the day this happened, it was normal and I did not smell anything foul. It was Castrol 10w 40 and it was a fresh oil change with only a few hundred miles on it.
Talked to the mechanic today and he pulled the cam and didn't find anything wrong, I asked him about the oil smell and he said there was no gas smell at all.
I have owned a number of inline 6's and am familiar with their sound. This is different, as I mentioned it was running and sounding normal when the sound suddenly changed. I am going to pick up the engine pieces and mess with it at home now. Probably just put the head off of it, on the block that is in my truck now since I don't want the 292 head that is on there.
The engine is torn apart so I can't exactly change the oil and crank it up, but I plan on getting/building a run stand since I have another 250 sitting in my garage (yes a third one). Here is a utube video I took of it when this happened...
http://www.youtube.com/watch?v=hwCT9iNM4lw
