Valve - Spring Squareness

WARNING: This page is about a different car, the 2003 Ford Windstar. However, it is still accessible from the selected car via links, so may be relevant.

Measure the out-of-square on each valve spring.
- Turn the valve spring and observe the space between the top of the valve spring and the square. Install a new valve spring if out of square. Refer to ENGINE article for the procedure.
  
  Fig 1: Measuring Out-Of-Square On Each Valve Spring
  Courtesy of FORD MOTOR CO.