Both will be fine. The Z6 might help your piece of mind but I didn't needed it.
HOWEVER....never put a B7 or similar crank pulley on a Z6, which is how I trashed the center three main bearings in 500-600 miles.
If there isn't a specific reason to run another crank pulley, I would just run what was originally on the motor.I am rebuilding a D15B7. Would there be any benefit of running a D16Z6 crank pulley (for reliability)? Or should I stay with the B7 pulley. From what I can tell my B7 pulley in not dampened.
Yeah this is my train of thought...Supposedly it’s a big no-no to run an undampened pulley because of the premature wear that it can cause on the main bearings. However, from what I recall, some earlier D16A6’s didn’t come with a dampened crank pulley so I’m not sure how much truth there is to this. I know Bone said he trashed some bearings after 5-600 miles and I certainly believe that.
I’m just wondering if it has to do with how much load there is on the crank pulley? In other words, do accessories like AC and PS increase the amount of wear on the main bearings? Is it ok to use an undampened pulley if you’re only running the alternator?
The JRSC crank pulleys for the Y7 and Y8 were undampened...
Here's some pictures:Tiny pic, can't see any detail.....