GM Service Manual Online
For 1990-2009 cars only

    Object Number: 177961  Size: SH
  1. Pour engine oil through the camshaft journal holes (2).
  2. Inspect that the engine oil comes out from the oil holes in the HVL adjuster bores.
  3. Apply engine oil around the HVL adjusters.

  4. Object Number: 177962  Size: SH
  5. Install the HVL adjusters (1) to the cylinder head.