Here is what I have gleaned on the 3.6L V-6 engine. It is for the CTS and SRX.
1. Here is info from the Noth American International Auto Show 2003:
The 3.6L V-6 VVT makes 260 (preliminary) horsepower at 6500 rpm and 252 lbs.-ft. of torque at 2800 rpm. The 60-degree dual overhead cam (DOHC), 24-valve powerplant boasts a number of performance refinements, including electronic throttle control, variable valve timing, multi-port fuel injection, two-stage roller chain cam drive, aluminum block and cylinder heads and a forged steel crankshaft.
2. From Cadillac Communications,
For the 2004 model year, CTS will receive numerous refinements, including the addition of an all-new 3.6L V-6 Variable Valve Timing (VVT) engine and redesigned instrument cluster. CTS will also be the first to receive Cadillac's "V-Series" treatment, which will allow the brand to compete for the first time in the prestigious high-performance luxury arena.
Personal Opinion: I wish Cadillac would stick with a couple of good engines and not try to have us be their proving grounds. Remember the 4.1L V-8 in the RWD Sedan deVille and Fleetwood? Guess what replaced it after GM went to FWD for Olds, Buick, Cadillac (replacing the RWD 98/88, etc.) -- the Olds 5.0L V-8 (307) and the Chevy 5.7L V-8 (350). I realize that they have a physical space limitation in the CTS between the fenders/front wheels. I'll bet the 3.8L V-6, Supercharged engine, would fit quite well in there.
Net, Net, 3.6L is a 60 degree V-6 NEW engine with VVT. Anyone want to gamble $40 Large on this baby? Not me, I'll wait for the tried and true 5.7L V-8 in the new V-series. I know what the track record (no pun intended) of that engine is! I have one already and it is bullet proof.