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I gotta go with Flaps and Marcus on this. VVT does not explain intake and exhaust valve damage. Now if you were on a spirited drive, spun the car clutch engaged, and allowed the motor to actually turn backwards, that would do the trick.
I like the ramp-material-chain-snag idea the best. Drop the pan and have a look around for big chunks of something.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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