Lingenfelter L250110309 Lingenfelter C6 ZR1 Corvette Supercharger Front Cover 2009-13 v2.2 - Manual (Page 36)

Page 35.
128. LPE LS9 two piece pulley removal:
The Lingenfelter two-piece LS9 pulleys have
twelve (12) holes on the face. Ten (10) of the
holes are not threaded and these are used to
secure the pulley to the hub. The two (2) holes
are threaded to accept M4 x 0.7 fasteners. These
two holes allow you to use two M4 x 0.7 screws
to remove the pulley from the hub. To do so,
remove the ten (10) M4x0.7x12 mm fasteners
from the pulley and then thread two M4x0.7x14
or longer screws into the two additional holes.
Tighten one screw and then the other to evenly
work the pulley off of the hub.