Cylinder Head Bolts Outer Diameter

WARNING: This page is about a different car, the 2007 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

Cylinder head bolts are tightened by plastic zone tightening method. Whenever the size difference between "d1" and "d2" exceeds the limit, replace them with new one.
Limit ("d1" - "d2") : 0.11 mm (0.0043 in)
If reduction of outer diameter appears in a position other than "d2", use it as "d2" point.

Fig 1: Identifying Cylinder Head Bolts Diameter
Courtesy of NISSAN MOTOR CO., U.S.A.