TKB4 wrote: It did also have damage to an intake valve. I bought it with 99,000 miles from guy near st. louis who had owned it about 30,000 miles and was driving it back and forth to gulf coast to work on oil rigs. He put GDE eco tune on it but I did homemade weeks kit also around 130,000 and redid TB service . At about 195,000 started having small coolant leak and so I did head gasket and new rockers but old ones still pretty good, and ARP s . I had driven it maybe 3000 miles then went on trip to South Dakota and on way back near Kansas City it quit at highway speed . I did hear a pop then some sputtering for couple seconds and that was it. Up to that point it was getting about 31mpg going 70-75 so couldn't have been too much off with valves etc. It is interesting that I seemed to smell some exhaust type fumes for probably 100 miles or so off and on I thought maybe it was a wire getting hot and checked under hood while fueling and didn't find anything. Also just after got it running again I heard what sounded like cam noise but retightened manifold nuts and this quietened it I know there was a small leak then. The cam was in good shape at teardown and very little soot in intake on both teardowns . So this occurred about 4,500 to 5,000 miles after Above service .
No EGR functioning since around 70,000 with GDE tune and no EGR at all after 130,000 and had kennedy lift pump and dual filtration with2 micron but never had air in fuel even before that. I haven't removed valve stem yet but I do have a microscope that I could look at it with. I also had head checked and a broken exhaust manifold bolt removed and replaced when did head gasket. I thought about doing exhaust valves but I don't drive this one but about 5,000 miles a year or less too I hoped it would last another 3 years or so till retirement when I would have more time to work on it. So I definitely lost my gamble.
I am not sure what the chances are. I know that I would be 15th one to answer pole about dropped valve but how many are not reported here and how many are never even torn down determine say difference between broken rockers and catastrophic damage like this. I tend to think there may be a hundred or more this has happened to. Not many CRDs have over 200,000 miles so it may be more a matter of time to discover the true rate. but if this happens to maybe 200 by 300,000 miles that would be about 1 1/2 % . I would be more encouraged if at least some of these engines makes it to 400,000 miles.
At least maybe the two I have put all new valves in low mileage heads will last another 150K and who knows since those valves came from VM Matori factory maybe they are not susceptible . I will be doing one more like that within next 6 months or so when I repair the wrecked one with good motor it has 151,000 miles now. Whats really bad is putting money in lifts tires torque converter weeks kit lift pump ARPs TB service Rockers head gasket GDE tune SAMCO hoses etc. then have this happen. At this point almost have to repair.
I feel your pain brother! Hindsight is always 20/20. 
If anyone pulls a head for any reason, exhaust valves should be replaced!
I am now leaning toward saying that if you are approaching the higher millage numbers and it is time for a timing belt change, bite the bullet and pull the head, inspect rockers and replace if needed, pull head and replace all exhaust valves and go back with ARP head studs. 
Should be good for another 200k or until something else fails or lack of replacement parts prevents repair.
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