The deformation of the split surface of the head is checked with a gauge and feeler gauge diagonally and along the head along the center line in several places (photo). If the deviation from the plane exceeds 0.076 mm in a 152 mm section, or 0.152 mm along the entire length of the head, the head should be re-ground. If the V6 engine head is being ground, the intake manifold plane should also be ground and the manifold adjusted to fit properly.
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