Cylinder Head Assemble

Tools Required

• J 38606  Valve Spring Compressor. See Special Tools .
• J 42863  Valve Seal Installer. See Special Tools .

Fig 1: Measuring Valve Stem Height
Courtesy of GENERAL MOTORS CORP.
1. Install the valves. The valves are available in standard size and 0.381 mm (0.015 in) oversize. Use oversize valve seals if oversized valves are used.
2. Use the following procedure to measure the valve stem height:
   1. Place the valve on the guide. Hold the valve in the closed position.
   2. Use a valve stem height gauge to measure the valve stem height.
   3. The measurement should be 49-50 mm (1.93-1.97 in).
NOTE: Use hand pressure only when installing the valve seal using J 42863. Using too much force may cause damage to the oil seal and possibly lead to excessive oil consumption.
3. Use the following procedure to measure the valve spring installed height:
   1. Place the valve in the valve guide.
   2. Install the valve spring cap and the valve cap keys.
   3. Seat the valve spring retainer by pulling up.
   4. Use a steel machinists' rule to measure the distance from the spring seat to the bottom of the valve spring cap.
   5. The measurement should be 42-44 mm (1.69-1.75 in).

      If the measurement is not within specifications add shims under the valve spring.

Fig 2: Installing Valve Stem Oil Seal
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Use hand pressure only when installing the valve seal using J 42863  . See Special Tools . Using to much force may cause damage to the oil seal and possibly lead to excessive oil consumption.
4. Place the valve stem oil seal over the valve stem so the seal begins to contact the valve guide.
5. Use J 42863  to push the valve stem oil seal over the valve guide. See Special Tools .
Fig 3: Installing Valve Spring
Courtesy of GENERAL MOTORS CORP.
6. Use J 38606  to install the valve spring and the valve cap. See Special Tools .
7. Install the valve keys.