Valve Guide
WARNING: This page is about a different car, the 2001 Ford ZX2 and 2000 Ford ZX2. However, it is still accessible from the selected car via links, so may be relevant.
Measure valve guide height from spring seat to top edge of guide. If valve guide height is not within specification, replace valve guide. See CYLINDER HEAD table under ENGINE SPECIFICATIONS. Measure valve stem-to-guide clearance. If clearance is not within specification, replace valve and/or valve guide.
NOTE:
Always reface valve seat after replacing valve guide.