For 1990-2009 cars

1. Inspect the valve springs. If the valve spring ends are not parallel, replace the valve spring.
2. Inspect the valve spring seating surface of the valve rotators for wear or gouges. Replace as required.
3. Measure the valve spring free length. If it is out of specification, replace it. Refer to Engine Mechanical Specifications.
4. Measure the valve spring right angles. If it is out of specification, replace it. Refer to Engine Mechanical Specifications.