[Excaliber]

2,300 miles just isn't enough to warrant a loose (or several as it seems to be) rocker shaft nut/bolt. Sure, it's always a good idea to check the torque on various bolts as you do your regular maintenance. Like I would have checked my valve clearance in the first year, I might have discovered a loose nut/bolt on the rockers, but might not have been specifically looking for it or going out of my way to check the torque on it. Regardless of mileage/time for warranty this very much smells like a defect in workmanship on Roush's part (just from what testimony we have hear on this thread).

Moving on...

Rocker shaft breakage is some what common on FE's, no big deal usually, no extensive damage usually. The shaft, though broken, is still held mostly in place by the various retainers, you loose valve adjustment, but not enough to damage anything. Simply replace the shaft and your good to go. Typically it's improperly adjusted end stand bolts that lead to a broken shaft, not something in the MIDDLE of the shaft.

The BIGGER question is: What other nut's/bolt's are "loose" somewhere else in the engine? I would be paranoid as heck right about now, wanting to double check everything, even the con rod bolts! Bummer...