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From what I've been seeing the vehicles ( 09+ : escalade, Sierra, silverado, etc) has RPO code l92. With same casting numbers as the LS3 as well as being all aluminum.
If you can't locate a l92. Consider a 6.0 ly6. The l92 I had was a 2010 vortec max from a Silverado. I listed it and sold within the hour. Haven't found another since. But do come across more ly6 now.