Not really...it is just the fact that every bottom end I bought has been a HIGH mileage motor...I'm too cheap to just go buy a nice one...and I'm not really on 5...it actually boils down like this...
2/2007 - Bought GTP
12/2007 - Lost motor to ZZP PCM...shattered the 3rd piston like no ones business...
3/2009 - Lifter failed...mucho internal damage...
6/2009 - Injector failed...cylinder #4 leaned out so far it turned everything white and melted the spark plug in the head, and the valve head was non-existant.
So...I guess not even high mileage blocks...just the fact I have REALLY bad luck. The one in March could have been prevented IMO...it had a lifter tick...but apparently it was A LOT worse than it sounded.