For all those interested, I found the answer:
370Z Engine (VQ37VHR) > 370z.com > 370z.com - Magazine
"The exhaust cams are conventionally fixed in place like the GT-R's VR38DETT. This is unlike the VQ35HR and the Rev Up motor that have adjustable on the fly advancing and retarding for the exhaust cam."
^ Very good read on that site. I recommend going back to page one and reading the whole thing. A lot of good info.