(NT855 Big Cam Gen 4) *BIG* Chunks of Metal from the oil pan

In a pervious post I noted the oil pan was basically vacuumed on. Got it off to roll main bearings but found HUGE Chunks of metal in the oil pan. Any ideas on what they're from? The only info I got with this is the engine (NT855 4th gen) was dropping oil pressure to 12psi and lower.

Any advice?

 

Brother in law things it's a connecting rod

 

Piston second from the grille has what looks to be "snow" on it. Guessing coolant

Rods and pistons (except for the piston and rod 2nd from the grille) look good. Rod has some scorching too

 

Scorching on rod

 

Camshaft has some iceing but looks good

 

Can't get a picture of it but piston 2 from the grill has burn marks on the inside of it. Don't have time to pull the head I gotta get rolling in the morning for my monthly time on the road.

 

Never-ending just found a Crack in the block....

 

Cracked block