Ford 2003 Mustang Workshop Manual page 1299

3. Using the special tool, compress the valve spring.
4. Remove the valves.
1. Remove the valve spring retainer keys.
2. Remove the valve spring retainers.
3. Remove the valve spring.
4. Remove the valves.
5. Remove the hydraulic lash adjusters.
6. Remove the bolts and the camshaft bearing caps.