Well thats it GAME OVER
Aluminium all through the filter. Thank god for being a mechanic home builder. My gut feeling was not good and was telling me their was an issue. I had thrown one of the main bearings on the crankshaft. Good thing I didn't do that flight over Katherine Gorge other wise I think I may have been a statistic. Game over for the trip and B line home from here.
After arriving back home I had a chance to tear the engine down. This is what I found
I took the chance to change and re-design a set of updated roller rockers for the engine as well