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Cam tensioner upgrade needed?

Engine

Vehicle Information: Year: 1981; Body Type: Targa;

I've read here that when you hear noise coming from the tensioners it is time to upgrade the tensioners...BUT, how do I know how much noise is enough?My Porsche mechanic commented on slightly higher than normal engine noise, but it isn't significant enough to hear in the cabin. I have excellent compression, valves are adjusted regularly. How do I know it is time? I want to drive a 1,000 mile trip but am worried.. safe is better than sorry but I will have to save for months to upgrade. Is there a tell tale sign?Thanks You

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