So what I;m asking is the Pulley won't hurt the engine at all. I just don't want sh*t to go wrong or dying in the long term.

Yes it would be fine I have my stillen for 24k miles now the car runs as fast as ever. But since its UD I think you need to change the alternator pulley too.

No, you'll be fine unless you have a huge stereo. I have it without an alternator pulley and have no problems

^ If Andrew said its ok then you can take his statement like a good check to the bank and cash it in!

All you need is to get a reputable mechanic to install it!
Have fun with your Z!

So for everyone who's blown their motors, I've always seen them run higher than OEM redline. I've seen the VVEL blow, the bearings blow, and the oil pump blow. I know the high rpm's killed those motors but I'm wondering how many had lightweight crank pulleys installed also. It just seems too risky.

And from holding a bunch of OEM crank pulleys after installing lightweight crank pulleys, they all seem solid but they're not. They all have a tiny rubber section splitting the two halves that you can move back-and-forth even with your own hands. Now imagine what kind of movement back-and-forth that can have at an 8000 RPM shift point.

^ So would you say for a few spirited runs in a week not even through redline is safe?

I redline my car all the time, Stillen pulley has been on for... 20-30k miles?

Oh well lets go redline then. Lol

If my engine blows thats gonna be good excuse to get a C6!

i would never install them on my car on any car i work on . the only damper other than oem ive even used is an ati fluiddamper . there is an reason its there . say you have an alternator starting to go bad at that point your are adding a side load on and off the end of the crank that with a rubber isolator you wouldnt have added to the crank . besides that it is made to remove harmonic vibrations caused by combustion and side loads on the crank at diff angles . hence the name harmonic balancer . the gains you will see from changing this are so minimal its not worth the risk .

risk vs reward = no beuno to me ..

its your car do as you will . ill leave you with this . look up whatever race motors you want you will see a balancer on there not a straight crank pulley . granted most of them are driving dry sump oil systems and or mechanical pumps . most teams use ati balancers in my exp .. very good product .. hell call your local reputable machine shop and ask him the value of the balancer . im not saying it will blow up tomorrow just that its there for good reason .

There are plenty of threads on here that talk about blowing engines using solid light weight pulleys. If your not AutoX or racing on Sebrings / Willow and your a guy that drives a little hard once in a wile you will be fine.

The ones that blow apart are doing dyno pulls at parties and racing there cars on tracks. You drive like that daily to work and back you need your engine blown.

Really? I can't find any where the pulley was the culprit