Valve Spring Squareness

WARNING: This page is about a different car, the 2013 Ford F-150. 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.
  
  Fig 1: Checking Valve Spring Squareness
  Courtesy of FORD MOTOR CO.