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If you know the service history on it from being new and it was good then heat is the next explanation, some of the wear is due to the design and the valves on a 6.0 are tiny in comparison to the 7.3 and long heavy hauls make lots of heat and can take it's toll on them. How do the intakes look, if they are in good condition then you may very well be right.
I was a machinest for 7 years and I mainly worked with the cylinder head work. Lubrication was the most common killer and usually the sludge would give away what condition the heads were before I even tore them down.
Extreme heat will tear up the valve stems and guides pretty quickly. I am assuming that the shop will magnaflux the heads and check for straightness. Myself it were my engine I would go through all the o-rings in the top end and replace them all, do the standpipes dummy plugs one peice stc oil cooler/ BP egr cooler ect to make sure you won't have to go back in again.
2006 F250 LARIAT CCSB 4X4: ARP Studs, O-Ringed Heads, X4 PHP Custom Tune, Atlas40 Ficm Tune, CAT EC-1 Coolant, IPR Coolant filter, Fass-125, turbo-back SS 4" pipe, Corsa muffler, No EGR , 6.4 Banjo's, 6.4 starter,DC Power 270 amp alt, 2/0 cables, Die Hard AGM, 7" lift w: Icon Progressive Coil Springs, 2008^ Carli/Deaver rear springs on fatty-daddy 38/15.50/18 Toyo's
Last edited by mhatlen; 10-24-2012 at 10:12 AM.