LS6 cam going in today.
#11
from what ive seen with my buddys 5.3 but different cam im guessing an easy 335rwhp or more !!!! NNBS with the right cam and supporting mods can and have put down 380rwhp on stock heads
#12
I put down 258/275 with tune, intake and muffler in my 5.3, but I know the NNBS are a different beast with the heads, TB and intake manifold, so I wouldn't be surprised if you broke 300 with the Z06 cam.
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