GM Service Manual Online
For 1990-2009 cars only

    Object Number: 2017113  Size: SH
  1. Inspect exhaust manifold.
  2. Note: If the warpage is greater than the maximum, replace the manifold.

  3. Using a precision straightedge and feeler gauge, measure the warpage on the contact surface of the cylinder head.
  4. Specification
    Maximum warpage: 0.7 mm (0.028 in)