GM Service Manual Online
For 1990-2009 cars only

Exhaust Crossover Pipe Replacement LS4

Removal Procedure


    Object Number: 1554543  Size: SH
  1. Remove the engine sight shield. Refer to Upper Intake Manifold Sight Shield Replacement.
  2. Remove the air cleaner outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement.
  3. Remove the exhaust crossover pipe heat shield.
  4. Remove the exhaust crossover pipe nuts.
  5. Remove the exhaust crossover pipe.
  6. Remove the exhaust crossover pipe seal.

Installation Procedure


    Object Number: 1554543  Size: SH
  1. Install the exhaust crossover pipe seal to the exhaust crossover pipe at the right exhaust manifold connection.
  2. Install the exhaust crossover pipe.
  3. Caution: Refer to Fastener Caution in the Preface section.

  4. Install the exhaust crossover pipe nuts.
  5. Tighten
    Tighten the nuts to 25 N·m (18 lb ft).

  6. Install the exhaust crossover pipe heat shield.
  7. Install the air cleaner outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement.
  8. Install the engine sight shield. Refer to Upper Intake Manifold Sight Shield Replacement.

Exhaust Crossover Pipe Replacement LZE/LZ4/LZ8

Removal Procedure


    Object Number: 1617973  Size: SH
  1. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement or Air Cleaner Outlet Duct Replacement.
  2. Remove the exhaust crossover pipe heat shield bolts.
  3. Remove the exhaust crossover pipe heat shield.

  4. Object Number: 1617975  Size: SH
  5. Remove the exhaust crossover pipe nuts.
  6. Remove the exhaust crossover pipe.
  7. Remove the exhaust crossover pipe seals.

Installation Procedure


    Object Number: 1617975  Size: SH
  1. Install the exhaust crossover pipe seals to the exhaust manifolds.
  2. Install the exhaust crossover pipe.
  3. Caution: Refer to Fastener Caution in the Preface section.

  4. Install the exhaust crossover pipe nuts.
  5. Tighten
    Tighten the nuts to 20 N·m (15 lb ft).


    Object Number: 1617973  Size: SH
  6. Install the exhaust crossover pipe heat shield.
  7. Install the exhaust crossover pipe heat shield bolts.
  8. Tighten
    Tighten the bolts to 10 N·m (89 lb in).

  9. Install the air cleaner intake duct. Refer to Air Cleaner Outlet Duct Replacement or Air Cleaner Outlet Duct Replacement.