The following is from an instruction manuel for an OC-3

 18  13  9  8  7  12  16

5         2    1    3       4

17  14  10  6  11  15

The numbers represent headbolts and the numbers indicate the sequence.  I usually do the sequenc several times starting with 10 ft pds then going to 20, then 30 and finally to 40 foot pounds.  I believe 40 foot pounds is the recommended torque.  Data is for serial # 350 0000 &amp;amp; up and 1WH000 &amp;amp; up.

Hope this helps,
John H.