From your link: “The 4.3 L V6 that came out in 1982 did have a denser head bolt arrangement, and did not suffer the catastrophic head sealing failures of the V

From your link: “The 4.3 L V6 that came out in 1982 did have a denser head bolt arrangement, and did not suffer the catastrophic head sealing failures of the V8.” V6 diesels were put in Cutlass’ until at least 1984: https://en.wikipedia.org/wiki/Oldsmobile_Diesel_engine#V6 https://en.wikipedia.org/wiki/Oldsmobile_Diesel_engine#V6