If the cylinder head is machined and
over .010 is removed, the holes in the intake manifold and
the cylinder head will not line up when reassembled. To correct
this condition, it is necessary to machine surface "B".
The amount that must be removed varies with the degree at
which the head is machined. The chart below shows the amount
which must be removed from the intake side of the cylinder
head so that the holes will line up.