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I am doing an engine rebuild now -so perhaps a little paranoid or wise.
One thing I learned is do not down-play 'noises' .Thoroughly diagnose them with a competent Indie early. It isn't just the cost of a timing chain mechanism failure -it is the widespread collateral damage that will break your wallet.The noise you hear may be chains flailing because of inadequate tension.Metal-to-metal contact inside the case could be either bad or disastrous.
I think the seals on the variocam tensioner solenoids were upgraded but that was way earlier than your build. Let us know what you find?
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