July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!
Valve Spring Squareness
WARNING: This page is about a different car, the 2008 Mercury Milan, 2008 Lincoln MKZ, and 2008 Ford Fusion. 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.