Cylinder Head Assemble

Tools Required 

• J 8062  Valve Spring Compressor
• J 42037  Valve Spring Compressor Adapter
• J 38820  Valve Stem Seal Remover/Installer

1. Apply sealant GM P/N United States 12346004, GM P/N Canada 10953480 or equivalent to the threads.
   NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
2. Install the (end) oil gallery plugs.

   Tighten 

   Tighten the oil gallery plugs to 38 N.m (28 lb ft).

   Fig 1: Installing (End) Oil Gallery Plugs

   Courtesy of GENERAL MOTORS CORP.
3. Apply sealant GM P/N United States 12346004, GM P/N Canada 10953480 or equivalent to the plugs.
4. Install the (inner) oil gallery plugs.
   Fig 2: Installing (Inner) Oil Gallery Plugs

   Courtesy of GENERAL MOTORS CORP.
5. Apply sealant GM P/N United States 12346004, GM P/N Canada 10953480 or equivalent to the plug.
6. Install the water jacket plug.
   Fig 3: Installing Water Jacket Plug

   Courtesy of GENERAL MOTORS CORP.
7. Use J 38820  to install the valve seals. There is only one size valve seal.
   Fig 4: Installing Valve Seals

   Courtesy of GENERAL MOTORS CORP.
   IMPORTANT: Lubricate the valve stems with clean engine oil before installing.
8. Install the valves. 0.075 mm (0.003 in) oversized valves are available if the valve guides needed to be reamed. Use the same (original size) valve seal.
   Fig 5: Installing Valves

   Courtesy of GENERAL MOTORS CORP.
9. Install the valve spring and the valve spring retainer.
   Fig 6: Installing Valve Spring And Valve Spring Retainer

   Courtesy of GENERAL MOTORS CORP.
10. Use J 8062  and J 42037  to compress the valve spring.
    Fig 7: Compressing Valve Spring

    Courtesy of GENERAL MOTORS CORP.
11. Install the valve keys.
12. Remove J 8062  and J 42037  .
    Fig 8: Installing Valve Keys

    Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Do not try to centralize the electrode on the spark plug. The electrode is offset by design.
13. Install the spark plugs.
    Fig 9: Installing Spark Plugs

    Courtesy of GENERAL MOTORS CORP.