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Deviation is out of spec. Usually worn chain ramps (plasticky guides that put tension on the cam chains). The Parts don't cost much but it's a labour intensive job. I Did mine last year when I dropped the engine. Mine were 5.x and 9.x ; much better now. I Can't say it changed the way the car runs. Maybe better gas mileage.
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James now has: 2008 987S 6 speed
Crashed: 2010 987.2 pdk in speed yellow! 
Sold to a cool racer chick: 2004 986 S
YouTube channel: the PORSCHE as seen by NewArt
www.youtube.com/channel/UCohdrH2xHTklM1thxk0KKOQ?
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