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165000 on my 03 6.0 , injectors changed at 101000 (just out of warranty of course!) and a fuel pump, that's it. Still runs great, everyday work truck. AC comes and goes, gotta get that checked, but other than diesel prices I have no complaints. ( I've owned it since new)
If you have an opportunity when the heads come off could you put a straightedge across the narrow in the center and measure and- deviation to flatness?
I have 218k on mine, but it does have studs, oil cooler and a Sinister EGR cooler. Using it to haul my 20' cargo trailer back and forth to TX, putting down about 2.5k per week,
Last week my 05 ccsb F250 6.0 rolled 500k on the meter. Still has factory headbolts and gaskets. Daily driven and it is tuned and has Powermax upgrade and more.
Bought new in oct 2006 6.0 w/6 speed manual, heavy duty packages still has original head gaskets, had the clutch, bearing, and arm replaced at 160,000 and all calipers and rotors changed at 166,000. Got 203,000 miles, filled up yesterday calculated mileage at 18.5.
Smokeploe