Wow, I was lucky I guess.
I was loaded at at somewhere around 8000' heading up along steep hill. With my GF & dad in the truck for good measure, on the day we left Saline Valley after 5 days there. I lost the piston (broken parts embedded in top of it), the valve looks okay but I'll have it replaced anyway, the cylinder wall is unscathed, the connecting rod is good but it may go too for good measure. The real trouble is the head- the cavity for the combi chamber has been enlarged slightly. I killed the engine fast. Machinist is pressing in one of the old ones to see if it will stay. I had hoped to know Monday but time is slowed in Bishop, CA where the machine shop is. The worst of this is that it is all happening 250+ miles away from me across the Sierras.
Crossing my fingers.....
Jeff