My shop CD gives 2 sets of tightening torques for headbolts:
1st
Hex. socket cylinder head screws (with engine cold)
Step 1 70nm
Step 2 90nm
Setting interval 10minutes
Step 3 100nm

2nd
Hex. socket cylinder head screws (with engine cold)
Step 1 40nm
Step 2 70nm
Setting interval 10minutes
Step 3 90degrees
Step 4 90degrees

I take it a "setting interval" is simply a 10 minute wait to allow the headgasket time to "settle"? Is there any difference between the option1 or option2? This seems very strange to me. Thanks, RT

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