★ Key Takeaways
A Good Rule for Flatness Is That Surface Flatness, Measured in Thousandths of an Inch, Should Never Exceed the Number of Cylinders on Each Bank Across the Length of the Block. for Example, No Block or Cylinder Head Should Exceed. 003" out-of-Flat If There Are 3 Cylinders, as There Would Be in an Inline-3 or V6 Engine.
Here is a detailed examination concerning How Flat Does a Cylinder Head Have to Be.
A Good Rule for Flatness Is That Surface Flatness, Measured in Thousandths of an Inch, Should Never Exceed the Number of Cylinders on Each Bank Across the Length of the Block. for Example, No Block or Cylinder Head Should Exceed. 003" out-of-Flat If There Are 3 Cylinders, as There Would Be in an Inline-3 or V6 Engine.
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