Lingenfelter L250280197 Lingenfelter C5 Corvette E-Force Supercharger Install Kit v2.9 - Manual (Page 22)

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49. Using a 10mm socket and ratchet, remove
the two (2) rear vent plugs, one on each cylinder
head.
NOTE: This step is for 2001-2004 model year
vehicles only.
50. Dislodge the two (2) rubber plugs that
cover the knock sensors. Unplug the knock
sensors and remove the harness by depressing
the sides of the connectors.
51. Using a 7/8” socket and ratchet, remove
both of the knock sensors from the valley tray.
52. Using a 10mm socket and ratchet, remove
the ten (10) bolts securing the valley plate.
NOTE: The OEM valley tray must be
modified or replaced with an LPE valley tray
(PN:XX04468-0021). This is due to clearance
issues with the supercharger. Diagram 2 on
page 85 shows the modifications that need to be
made to the OEM valley tray. LPE offers an OEM
valley tray that is machined and ready to install in
place of the factory OEM tray.