10 sec 6.1 ?

8 lbs on a stock srt is about as far as I'd go if you want it to run over 50K miles. you can run more for a while but it will fatigue. I'm not sure 8 lbs on a stock engine will get 50 K if you push it alot. Correct though the tune is critical.

The 450 RWHP cam only dyno on the site was my web developer getting enthuastic. That guy did get a 450 dyon but then again I had a guy get 509 with that cam, ported heads and an intake and although he holds the stock block challenger record I'm about sure your typical dyno jet would put him at 460-470 and the cam only at 410-425 RWHP.