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Originally Posted by tateos  So AJ, you say that:
If you just fix the bad ones and 75K later a different one fails you can fix the ones needed.
I think you are saying that if you insert all 20 holes at the same time with the initial failure, some of them can be expected to fail again in the future, right?
I think you could be right about that... if the head gasket initial leakage ultimately causes corrosion of the threaded hole in the block, then that same corrosion will take place when the replacement gasket starts to leak after 75K miles or whatever the mileage is. The only thing is, I think the Norm's inserts (I know you are a fan) will hold up longer, since they engage a longer area and they have a coarser/deeper thread. Also, how many cars are worth replacing or even repairing the engine in by the time the second HG has let go? |
Correct on the expected failure and GM changed to a courser bolt in mid 2003
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Originally Posted by JC316 But if you do all 20 and it lasts longer than 75K miles, then it was better than just doing one. I mean, how many people have had the timeserts fail under normal useage over the years? |
We see them all the time. If the block has been TimeSerted and a head gasket fails most tech walk away from that engine. Remember the TimeSerts come out with the bolts about 75% + of the time.