LS3 is definitely better for nitrous oxide and or boost...much cheaper to fix/replace if you blow shit up as well :beer:
The valve stems breaking on the LS7 is maybe a little overblown, but I would sure hate to cough up the money to fix/replace that 427....
Yeah I am sure it's not as bad as people play it off as, but I would still rather have an LS3, then do some stuff to it and beat Z06's. Cammed LS3 will run right there with a bolt on Z.