Outer Diameter of Cylinder Head Bolts

WARNING: This page is about a different car, the 2004 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

Inspect the cylinder head bolts before installing the cylinder heads.
CAUTION: Cylinder head bolts are tightened by degree rotation tightening method. Whenever the size difference between d1 and d2 exceeds the limit, replace the bolts with new ones.

Fig 1: Inspect The Cylinder Head Bolts Before Installing The Cylinder Heads
Courtesy of NISSAN MOTOR CO., U.S.A.
1. Limit (d1 - d2): 0.11 mm (0.0043 in)
If a reduction in outer diameter appears in a position other than d2, use it as the d2 measuring point.
Lubricate threads and seat surfaces of the bolts with new engine oil for installation.