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Yep, I did them one at a time from center to outside. Set them at about 45-50 ft/lbs and then I go to about 95 ft/lbs from center to outside after all are in with new bolts, but if the torque stops at about 80-90 and you can feel it not get tighter then stop. So I end up with something around 85-95 ft/lbs on all. I use a very old non-digital torque wrench.
Fixes (not guaranteed) the "cooling system over pressure" problems on two i4's so far. One 99 i4 LPT and one 01 i4 HPT.
I would consider this a preventative service for all 99-00-01 (02-03 maybe). At least check the current torque and if they are under, say, 70 would replace. One had all < 60 and would not tighten up past that. I have a few more 9-5's LPTs that I will have to check soon.
Some have said that there was a problem from the factory on head bolt torque amount.
I have never done this on a V6 yet.
Any others see the same thing?
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