Lingenfelter L250110309 Lingenfelter C6 ZR1 Corvette Supercharger Front Cover 2009-13 v2.2 - Manual (Page 24)

Page 23.
82. The idler to be replaced is the factory 90
mm idler found on the driver side of the vehicle
(not the 76 mm idler found near the water pump
and tensioner).
LPE also offers an aluminum double bearing 76
mm idler and the parts needed to replace the
76 mm idler found on the passenger side of the
engine (LPE part # L250120309). Contact LPE
or your LPE distributor for more information.
83. Using a 15 mm socket, remove the bolt
that secures the factory 90 mm idler.
84. Place the supplied idler locating spacer
on the back side of the idler. Place the supplied
dust shield/cover on the front of the idler pulley.
Put the supplied bolt through the idler and
install the assembly on the engine.
Using an 8 mm hex bit Allen socket, torque the
idler bolt to 50 Nm (37 lb-ft).
81. If you are using a pulley combination that
requires a different idler, replace the factory
idler at this time. Follow steps 79 to 81 for
installing the new idler. See table 1 on page 37
for information on what size idler is needed for
different pulley combinations.