A bad valve guide will stick the valve, allowing it to hit the piston then hit the pushrod, rocker, lifter out of sequence.
I'd look into that very closely LJ.
The valve is GTG. Talked to the dealer today, he said that he's had an engine that crashed 3-4 times break a rocker stand in the same fashion. He said it's not common, but it's not rare either.
The lifter he's never seen broken aside from a classroom setting, but he said that he agreed with my hypothesis regarding the way the lifter rounded over on the broken edge. He also said check all the lifters, which only makes sense to me.
I knocked down 7 trees between classes to earn some "lunch money" in about 20 minutes. It covered the manual, wrench, and my lunch with a couple bucks to spare.
Regarding the engine, I've got all the lines broken, everything else ready to geaux. In the morning I'll grab plugs for all the hydro lines and some eye bolts and nuts to put through the motor mounts to provide solid lifting points. Hopefully by this time tomorrow I'll be declaring I'll start sliding the engine back in "tomorrow afternoon after class."
Hopefully I won't run into any supprises while taking the motor apart. Going to study the manual tonight to try to be prepared for any issues.
Glad your truck issue was fairly straight forward, MB.