N14 dropped valve or cracked piston

Some brothers in my area have been in the cattle hauling party with their dad a long time out here. They have always been Cat guys for the most part. Well 12 years ago they ended up with one of my uncles Pete 358’s named “short block” with a bc 1 in it to use in their rodeo “clown” show. They have always been used to E model’s and lugged them around all the time. On 3 different occasion's I hear old short block coming from a mile away sounding like its anchored to a building and struggling to make any rpm’s. They come around the bend in front of my property with 24 round bales doing around 30mph in what sounded like top gear while wot. I said to myself them boys are gonna kill that thing lugging it like that as i cringed and cried.
Needless to say soon after i see the truck sitting at there pens with the hood off and engine torn down. Ran into one of them a couple months later at the chrome shop and he was complaining to me how the engine work was crap in that truck and it wouldn’t hold together. He said they put a straight edge on the deck and it had white capped waves on it. Lol! Smh. 10 years later it still sits because now they wanna put a Cat in it. Smh.

 

Spun bearing no but broke piston would. Spun bearing could cause broke piston if it hit something on its stroke.

 

I have seen spun bearings result in no oil psi change before. Cummins oil pumps are like fire hose pumps they move a ton of oil and are overkill. They were regulated many different ways over the engine generations. The old nh’s ran 100 psi cold 80 hot with same design 75 years ago.

 

It looks like number 2 is considerably more oily than the rest. Might be an indication of a problem or just sucked in more oil from the turbo than the others. It would appear in the pictures that everything up top is ok. You might have to start pulling heads to look for the cracked piston. It might or might not be pretty obvious. Do you know any history of this engine

 

Have you tried running it with the top off and see if one rocker box has more steam rising from it?