If anybody has any doubts about the LSA, then I'd suggest they make a point of arranging to test drive a CTS-V. I'm thinkin' that experience might answer any questions about that engine.
FWIW, GM had a number of cars for the "Disciples" to drive this past weekend at the Milford Proving Grounds and there were 2 CTS-Vs available for us to thrash around - a coupe and a sedan.
In a nutshell, all of the Disciples who drove 1 or both of them were blown away by the performance of the car!
Best regardSS,
Elie