GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Corvette 🢒 Engine 🢒 Engine Mechanical - 5.7L 🢒 Engine Block Valley Cover Installation

    Object Number: 490851 Size: SH

    Important: All gasket surfaces should be free of oil or other foreign material during assembly.

  1. Install NEW knock sensor oil seals (1) into the valley cover (2).

    2. Lubricate the seal surfaces with clean engine oil.


    Object Number: 65048 Size: SH
  2. Install the valley cover and NEW gasket - LS1.

    3. Object Number: 668798 Size: SH
  3. Install the valley cover and NEW gasket - LS6.

    4. Notice: Refer to Fastener Notice in the Preface section.

  4. Install the valley cover bolts.

    5. Tighten
    Tighten the valley cover bolts to 25 N·m (18 lb ft).


    Object Number: 309864 Size: SH
  5. Install the knock sensors.

    6. Tighten
    Tighten the knock sensors to 20 N·m (15 lb ft).


    Object Number: 309859 Size: SH
  6. Install the knock sensor wire harness.