[cas3]

"If " its a wrist pin, I drove an old 68 White truck , 290 cummins, for 10 years with a wrist pin knock that started years before I got in the drivers seat. Seasonal job, but we put about 10k on every summer so I did about 100k and it never changed. It would rap pretty good when cold, but going down the road it was not noticeable.

If you keep good oil pressure I would drive it a bit and see if it changes. A wrist pin should not blow up and wreck everything.