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2007 CTS 3.6 >140k miles
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1,053 Posts
Is it possible that a valve or valve seat has sufficient buildup to prevent it from seating? If so it may be worth removing valves for cyl 3 and 6 to explore.

If valves are good, the only other possibility is the rings. Hopefully that is not the problem.
 

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Registered
2007 CTS 3.6 >140k miles
Joined
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1,053 Posts
One more thing. If the rings are not sealing but otherwise intact, you may get lucky and solve the compression problem with a piston soak. It may be worth trying this before removing the heads and digging deeper.
 
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