Lingenfelter L250280197 Lingenfelter C5 Corvette E-Force Supercharger Install Kit v2.9 - Manual (Page 21)

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45. Vacuum any dirt in the valley area and
around the intake ports. Clean the head surface
with a clean rag, then tape off the cylinder head
intake ports to ensure no debris enters the
engine. It is very important that no dirt gets in to
these ports. You may need to clean off any oil or
debris using a solvent such as engine degreaser.
46. Remove the 90 degree hose from the
vapor vent tube. It is very important to keep
this tube as it will be re-installed at a later time.
NOTE: This step is only for 1997-2000 model
year vehicles.
47. Remove the knock sensor wiring
harness clips from the vapor vent tube.
NOTE: This step is only for 1997-2000 model
year vehicles.
48. Using a 10mm socket and ratchet, remove
the four (4) bolts securing the vapor vent tube to
the cylinder heads and remove it.
NOTE: This step is only for 1997-2000 model
year vehicles. The vent tube is to be left in place
for 2001-2004 vehicles.