What engine was it? In the mid 80's, Buick and Olds mid size cars used a 3.0 engine that was the fore-runner of the 3.8. The 3.0's used a composition cam gear that would run 80K to 100K miles and shred the gear teeth off the metal base.
But-while the gear teeth were shredding and the engine was still running OK, the debris from the gear teeth plugged the oil pump and took out the lower end bearings. The front rod bearing was usually the first to go. Or sometimes the cam gear would go and people would replace the gear without cleaning up the bottom end. Then a couple thousand miles later, the bearings would go.
It wasn't an interference engine, but besides replacing the cam gears, you still had to tear it down, clean up the bottom end, grind the crank and replace the bearings. Usually rering it at the same time while it was torn down. I did a half dozen or more of them.
In fact, in the late 80's I bought a couple of Buick Centuries that had the problem, rebuilt the engines, and used them for daily drivers for our daughter and myself.
I ran into an 87' Buick LeSabre with a 3.8 that did it. I suspected the 3.8 took the same cam gear and GM had a bunch of the fiber gears left over so they used some in the 3.8.
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