GM has always made it's own engines. The 6.2/6.5 was never known to be a powerful or quick engine like the new diesels, but were know to last 350-400k miles. We had a couple 6.2 with 200-290k miles on them and they ran great. The only problem the olds 350 diesels had was cheap head bolts. They were gas head bolts designed for 9:1 compression trying to hold diesel heads on a 18.5: motor.
But all their truck diesels are workhorses.
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