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'12 CTS Performance Sports Wagon AWD
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My engine is an LFX (3.6 but should be similar) and does not have that hole. I wouldn't worry about it though. These engines are used in many different GM Vehicles and if nothing is really apparent It is likely just a place to mount something for another vehicle. Since it is threaded and looks like it only goes a little deep before it is blocked off it appears to be a hole to mount a bracket to or something.
 

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**2014 CTS4 Sport Wagon-Luxury**
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I have a 2014 CTS4 Sport Wagon with the 3.0 LFW motor and although I had a little difficulty with orientation I have the same threaded and nothing attached holes under the hood as you do...

Bill
 

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Discussion Starter #4
I have a 2014 CTS4 Sport Wagon with the 3.0 LFW motor and although I had a little difficulty with orientation I have the same threaded and nothing attached holes under the hood as you do...

Bill
Thanks! Good to know this is normal. Maybe some sort of point of inspection for spec purposes or a breather
 

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Go ahead, blame me. Everybody does 🙄
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Most likely a mounting point for some other application. Perhaps FWD.
 
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