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jgp @ Jan 3rd 2008 4:20PM
The LS motors are fine for the Vette and "ordinary" sport sedans like the G8 and (fingers crossed) a future Impala SS.
But pushrods will always have severe NVH issues, and NVH should never be associated with Cadillac. Not even remotely.
The Northstar is bloody outdated, and the LS isn't fit for Cadillac. The Ultra V8 should have put Cadillac back on the map with a flagship ready to take on the BMW 7-Series and Mercedes S-Class.
The HF w/DI is an impressive engine, but Cadillac's upcoming flagship needs an engine with more than 300hp. I can easily see an HF-based 4.8L V8 with over 400hp (assuming the same hp/cyl as the 3.6L DI V6). Bore it out a bit more (how does 5.3L sound?), and it'd easily surpass the supercharged Northstar.