As mentioned a lot has to do with tuning. I have a few 550 RWHP SC and TT cars out there running well on stock engines. Get to the 575 area and it seems I run into the ringland breaking between the top and second ring.
Now keep in mind that most of these cars are drivers with occasional WOT on the street or track. If you are a hard driver a lot of the time, then you can expect issues such as pinched rings and burnt pistons at the 550 level from what I have seen.
I would also install a good set of valve springs on a stock LS to be safe.
Hope this helps.
Mike Norris
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