I did find this in the first (and only) 350 I ever re-built-
Apparently, I failed to properly torque down the rod caps. The nuts spun off at about 2,500 rpm if I recall. After towing how, we did a tear down and found af ew other objects.
The cam was broken into five pieces.
A rod bearing folded up like a stick of gum.
Chunks of cylinder bore.
The rod cap with part of it sheared off.
A shattered hydraulic lifter. (I can take it apart to see inside)
Motto, always check your work. I think I was 19 at the time and figuerd a book was all I would need to assemble an engine.
Oh yeah, the oil was Penzoil. I think I had 100 miles tops on the engine when this happened.