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I dont know how much exactly, except with my 15mm spacers, I have maybe 4-5mm left between the spoke (17" OEM) and the calipers.
I'll post and find out.
I have no pics of GS rotors and LS calipers. At the moment I'm running my LS4 on LS rotors. I'm not sure if I would even run the calipers on GS rotors.
i would upgrade the rotors as well there almost a inch bigger in diameter so you will ruin your pads with the stock gs rotors. and gsteg is right our master wont support the back being 4 piston of that size. mine has trouble keeping up with the supercharger it needs more vacumm for the booster! looking into myself to get the most out of my upgrade.