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I expect that with good care 6 or 700K would be possible.
In taking these motors down for other reasons, at 275K we typically find virtually no wear on the bottom end. The chain guides and cam chains do wear though and have to be changed. Also an engine killer is the chain drive oil pump on the 617 turbo motors. Its down out of sight but is much shorter than the cam chain so it gets five or six times the wear.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.
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