Use a straight edge and feeler gauge to measure the overall flatness of the cylinder head deck. The overall
flatness, side to side, must not exceed 0.075 mm [0.003 in]. The overall flatness, end to end, must not exceed .203
mm (.008 inch) for the 4B and .305 mm (.012 inch) for the 6B.
Visually inspect for any localized dips or imperfections. If present, the cylinder head deck must be ground.
Refer to the Alternative Repair Manual, Bulletin No. 3810234 for regrind/milling procedures and limits.
