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Originally Posted by Cliff R
All of the 6.2's I've been into had iron cranks. The turbo charged 6.5.s are supposed to have steel cranks, but I'm not sure?
The 6.2's come in several "flavors", very early units have different rocker arm set-ups, water pump, etc.
None of those engines are overly impressive, in any configuration, and every single one I've had apart had major cracks in the pre-combustion chambers, and some across the exhaust valve seats.
Those engines are NOT direct injected, or did they have intercoolers on the later turbo charged versions, they are basically considered TURDS in the diesel world, at least compared to other designs. Some folks have still spent the time/funds to get some pretty impressive power from them, so they do have some potential.
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The iron cranks are bad about breaking around the 2nd main cap.
If I can find a 3.9 Cummins BT I'll go that route -
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Two 1975 455 Grandvilles &
'79 455 Trans Am
‘69 Camaro SS 396/375 (owned since ‘88)
‘67 Corvette 427/435
‘23 Lexus LS500 awd
‘20 Audi R8 & ‘25 Toyota RAV4 (wife’s cars)
‘95 Ford F250 4wd 7.3 p-stroke
& countless Jeeps & off road vehicles & motorcycles 
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