Visual Inspection

1. Inspect the cylinder heads for cracks or excessively burned areas in the exhaust outlet ports.
2. Replace the cylinder head if it is cracked.
3. Check the cylinder head gasket surface for burrs and nicks. Small imperfections can be dressed down using an oil stone.
4. Inspect the cylinder heads for damaged spark plug threads. Repair as required.
5. Inspect the camshaft journals on the cylinder head and camshaft carriers caps. If excessive wear or galling is present, replace cylinder head.