Death of a /6

I've tried to break one but couldn't. The magic of this engine is that it's just underpowered enough and built well that it has a hard time hurting itself. The last one I had ran up to almost 400k and it was in a truck. I actually floored it several times for several minutes while it was on the trailer to go for scrap but it wouldn't die. The truck rusted in half though.
Years ago at the Rockford Speedway, the had an intermission where they took a Ford,Chevy and Dodge and ran them without fluids with a brick on the pedal. The Ford never started, the chevy ran about a minute and they had to shut the Dodge off to continue racing. It was a /6 Aspen.