factory drilled 2 piece rotors?

[Tracker1]

What is with the holes in these 69 Z rotors? balancing? service replacements?

http://www.yenko.net/ubbthreads/pics/usergals/2016/04/full-3497-42575-rotor.jpg

[Lynn]

Balancing. I have seen various numbers of holes.

[Tracker1]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lynn</div><div class="ubbcode-body">Balancing. I have seen various numbers of holes. </div></div>

As installed from Norwood &amp; LOS? Thanks Lynn.

[Kurt S]

As manufactured and supplied to the plant.

[Tracker1]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Kurt S</div><div class="ubbcode-body">As manufactured and supplied to the plant. </div></div>

So was it pretty random occurence Kurt, or a &quot;during a certain month of the year&quot; kind-of-thing at both plants?

[Kurt S]

Just as needed to balance the rotors. Mine have at least 4 holes.

[Tracker1]

Thanks Kurt.