I was looking into a stoker LS3 as well. I wanted to keep it under a 4" stoke just to keep from beating it to death with reving it over 7k often.
The LS7 cracked liner deal I found on corvette forum doing a search for LS7 stuff. They all agreed that keeping it under 600 flywheel they will live but much over that they have had some cracked liners with the guys that track them.
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