Yes, they can definately fatigue. It makes more sense now that you mention they have "miles" on them. They are excellent pieces in my opinion, but like anything, yes they can break over time but I would have to assume they have had a more than useful life. I just dont see them break without an explanation of oil starvation, too much spring, binding conditions, plugged oil holes, over-revved etc.



I just took a set off a car last year that I know had 17 years on them. It did finally break one and it was time to call it quits.Put a new set on and hope the customer can get another 17 years!