Code:
Remove the valve cover bolts in this order
11 4 8 6 9
1 13 2
10 3 7 5 12
Install with this pattern
11 6 2 4 8
12 1 9
13 7 3 5 10
STEP 1: Tighten bolts 1 - 10 - 11 - 13 - 8 in that order
Step 2: Tighten bolts 1 - 13 in that order 8-10 Nm (0.8-1.0 kg-m, 69 - 87
in-lb)