Don't do it, not worth it, will cause more harm than good. Don't mess with the factory crankshaft damper either. Engine is internally balanced, and those who have messed with those aftermarket crank pulleys that aren't dampers, have got cracked flex plates. Harmonics is a biotch.
Look for power elsewhere, such as static and rotational weight/mass.
4'' intake setups work very well with these engines.
Your engine since its a CVTCS vk56 (has intake cam phasing only) and the newer revised intake manifold, you're already ahead of the game with the VK56DE engine variants.
4'' cold air intake, JBA headers with 2.5'' secondary mid pipes into a 2.5'' x 3'' Y pipe, borla Xr1 muffler, routed out the back or dumped, however.
Uprev tune it of course.
Through the 5spd auto you're looking at 330-340rwhp, 380rwtq or more. (dyno and tune dependant)
With the 6spd manual, you'll put even more power down to the ground from less drive train loss.
If you really want to go faster, get JWT Cs2 cams.
If Titan owners can click off 13.1 and mid 12s in 5000lb 4x4 Titans in the quarter mile, you're 350Z chassis should be able to obtain similar results with the right supporting traction aids/modifications etc..
Heck, no cammed titans run mid 13s all day with over 150k miles on them.
Tuning and the aftermarket has catered to the Titan alot more so over the last 3-4yrs.
Can make these engines very powerful for little money. You can get JE pistons and Brian crower rods for around $2000, use oem bearings, head bolts, head gaskets, etc...
The jet boat guys use this engine with the setup i mentioned above, but using twin turbos and different intake manifold, they are making 1200-1350hp for 100s of hours Wide open throttle at the rev limiter for years before being rebuilt. Stock block, and crank can handle plenty.
The VK56 is no more expensive than building a coyote 5.0. Probably less honestly if just doing the shortblock.
