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I am pretty sure a main cause of the deviation comes from the cam tensioner pads that wear out for the timing chain between the camshafts. My deviations were 6 and 9 rock steady. When I pulled the camshafts during a rebuild (unrelated to cam dev) both tensioners had plastic ramps that looked like a dog chewed them up. They would not have lasted much longer. The rest of the chain ramps looked almost brand new. I believe Porsche updated the material the tensioner ramps are made of to reduce the wear.
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