3-Series (E21, E30)Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.
sorry, I know it's a horrible excuse but my car decided that it didn't like to cool itself any more, so I was kinda busy with that.
Hopefully it's just a bad thermostat and no engine damage occured.
To answer your question...
All it says in the book is that "A warped cylinder head can be machined provided no more than .3 mm (.012 in) of material is removed. If further machining is required, the head should be replaced."
It has a picture of a head with a straightedge and a feeler gauge that is labeled "Straight edge and feeler gauge being used to check straightness of cylinder head gasket surface"
I don't see any variance for how straight or tight the straightedge needs to be across the top of the head.
There is a chart that has the max and min measurements for the height of the head (before/after machining)
Sorry I couldn't be more help.
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