C 1500 Yukon 2WD V8-5.3L VIN T (2002)
6. Install J 22794 into the spark plug hole.
7. Attach an air hose to J22794.
8. Apply compressed air to J 22794 in order to hold the valves in place.
9. Use J 38606 in order to compress the valve spring.
10. Remove the valve stem keys (3).
11. Carefully release the valve spring tension.