Valve Spring Squareness
WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.
Set try square along the side of valve spring and rotate the spring. Measure the maximum clearance between the top face of spring and try square.
 Courtesy of NISSAN NORTH AMERICA, INC.
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| Out-of-square limit |
: Less than 2.0 mm (0.079 in) |