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Sounds familiar....my '70T had a complete engine rebuild about 6 years ago. According to the receipts, the tensioners were replaced at that time. I bought the car last year and it only had about 5000 miles on it since the rebuild.
Last year, I started hearing a horrific noise when the car was idling but the problem seemed to come and go. I didn't know what the noise was until I consulted the bright lads on this board. I opened up the chain cases and sure enough, the left tensioner had failed. I ended up putting in new oil-fed tensioners (and changing the ramps at the same time!)
Moral to the story......it's a real crap shoot!! If I were you, I would at least install the collars on the tensioners and keep your ears tuned for strange noises!
Good luck
__________________
Ron
'96 993 C4S happy again 
'03 996 gone..... No regrets 
'95 993 gone.... So sad 
'70 Signal Orange 911T Targa (gone but not forgotten)
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