Lingenfelter L250280197 Lingenfelter C5 Corvette E-Force Supercharger Install Kit v2.9 - Manual (Page 26)

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65. Remove the 90 degree elbow attached to
the vacuum line at the rear of the engine.
64. Using a 5/8” spark plug socket, remove
the stock spark plugs and replace with the proper
heat range spark plugs. LPE recommends AC
Delco LS7/LS9 spark plugs (PN: 41-104). Torque
the new spark plugs to 11ft-lbs, then reinstall the
spark plug wires onto the spark plugs.
66. Spray a small amount of lubricant into the
end of the black vacuum hose provided and slide
it onto the plastic fitting roughly two inches.
67. Route the hose towards the driver side of
the engine block and out of the way until ready to
install other end of the hose.