ZLX question

[Citation_sp]

In engineering terminology "X" usually means cast iron. so ZL-X could just be GM's way of stating cast iron components.

[Tracker1]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Citation_sp</div><div class="ubbcode-body">In engineering terminology &quot;X&quot; usually means cast iron. so ZL-X could just be GM's way of stating cast iron components. </div></div>

I don't believe GM/Chevrolet ever used ZL/X in their sales pieces. As mentioned, it isn't in the green sheets book. I agree it's a Motion term that was popularized by Chevy parts guys in the know.