GM Service Manual Online
For 1990-2009 cars only
  1. Clean the following areas:
  2. • The engine block in solvent
    • The gasket surfaces
    • The coolant passages
    • The oil passages
    • The oil filter by-pass valve and spring
  3. Inspect the following areas:
  4. • Cracks in the cylinder walls, the coolant jacket, the valve lifter bores, and the crankshaft bearing webs
    • The oil filter by-pass valve for operation