Hi @Seanc9XFAH,
The values you see are a tuple of coordinates from an AutoCAD Point3d object. You can get the Z values directly with a couple lines of Python.
import clr
clr.AddReference('AcMgd')
clr.AddReference('AcDbMgd')
from Autodesk.AutoCAD.Geometry import *
tuples = IN[0]
output = []
if not isinstance(tuples, list):
tuples = [tuples]
for i in range(0, len(tuples)):
output.append(tuples[i].Z)
OUT = output