RE: Theres Trouble (G8/GXP) LS3-402hp....4.7!!!
it's the LS3, but a de-tuned version of the Corvette's LS3 which puts out somewhere in the 430hp range. The GOAT had a 6.0 LS2 and supposedly it wasn't very consistent with the power. So the LS3 is im pretty sure a 6.3 litre engine.