The OEM lifters are proned to make noise with these kind of miles. I would recomend when you change your next T belt to throw in a set of new lifters..... They are expensive at $22.00 each, X 20. But they are almost there when the belt and tensioner go in. (I had a set repolished and checked by aluminum head rebuilders, and they are a CHEAP alternative to new ones, as well....) If they do go bad, they loose their resistance against the cam, and you will have some slop generated..... I have seen bad lifters go 50,000 miles with little loss of performance, etc...
Hope this helps you out!
Mke
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