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These are my comments. I think a lot of the times the timing chain snaps when something got in the way; vacuum pump failure, guide, tensioner etc. So it is a crap shoot to predict when to replace them. I think all my cars have original chains, they are at 360K, 370K, 315K etc. The one with the lowest mile is about 260K. In theory they are long overdue but they look in pretty good shape. I never did any chain stretch measurement as I doubt how accurate a prediction it is. I had one oil pump chain snapped on me at 305K on a SDL. I could never understand why, may be a piece of the plastic guide broke off. So I always replaced the oil pump chain if I took the pan off.
But don't get me wrong, I bought timing chains already but is waiting for an opportune time to roll it in. The bottom line is that roll a new one in if the OP is concern. However, there is always a risk that some other things broke and take the new one out. Who knows?
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