I'm not real up to date on them, but as recently as 1998, they came with a 300 hp Northstar 4.6L DOHC 32 Valve V8 (N/A). They weighed over 4000 pounds, but still did a 15 sec. 1/4 mile (stock). I know that simple head/cam packages can bring the hp to over 450. I've also heard that the 2003 Northstar 4.2L DOHC 32 Valve V8 is conservatively rated at 350 hp (N/A), and 425 hp w/ a supercharger, but I don't think any are on the street just yet. Not sure though.
Take care,
-Chris
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