Ford 2003 Mustang Workshop Manual page 1689

4. Using the special tool, install the intake valve spring, the spring retainer and the valve spring
retainer keys.
5. Install the Valve Spring Compressor Spacer between the valve spring coils to protect the intake
valve stem seal from damage.
6. Using the special tool, install the exhaust valve spring, the spring retainer and the valve spring
retainer keys.
7. Remove the compressed air hose from the cylinder.
8. Install the spark plugs. For additional information, refer to
9. Install the roller followers. For additional information, refer to
Section 303-07C .
Roller Followers in this section.