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My truck has been doing that for almost two years now.
Based on fuel trims, power output, and relative compression I wouldn't say it's rocker arms.
Sounds more like piston slap on my truck to me, if your noise is exactly the same.
I haven't lost a whole lot of sleep over it.
There's also the possibility of a cracked flywheel on my truck causing the noise, but again I haven't really got into it yet. It used to go away when I changed the oil but it seems to be there all the time now.
There's actually a TSB for that noise, says don't try and fix it, it's normal, but I am not really convinced.
Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
There are strange things done 'neath the midnight sun by the men who moil for gold.
The arctic trails have their secret tales that would make your blood run cold.