It must still have the dump truck pistons in it. I've never had one apart but if they resemble the 4 ring ones GM put in their 366 and 427 tall deck truck motors, I have seen the results of one too many trips to 7500.

Destroyed everything except 1 head and the intake and I think it had a scuff on the bottom from a rod that came up thru the valley.

Funny thing was it didn't come unglued until the drive back home. Just cruising along, a little vibration and BOOOM!!

Kevin