Hadn't heard of any LS7 valve problems, just them dropping.. when the bee-hive spring fractures as the rocker arm spits out it's needle bearings..
I've talked with a few of the Wixom boyz that build 'em ... and soon to be the new LS9. Gotta love that 5 yr, 100K mile drive train warranty.
...sorry, a little off topic
back to our regular sceduled programming folks
Dave