I'm not sure what year ford started using roller lifters, but GM did a mild redesign on the 5.7 diesel engine in 1981, due to reliability issues. That was the first GM engine that I saw roller lifters in a production engine. I actually owned a 1981 Bonneville with a 5.7 diesel, that ran 150,000 miles with the original engine, before I sold the car, so they must have actually improved it. The car got totaled, shortly after I sold it, so I have no idea how long it would have run.
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Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
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