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Search LS9 cam and there's like 14 pages of threads. Search ADM and LS9 cam, or ADM stage 1 cam and they posted before and after dyno's on a completely stock car back in 2009.
It's worth 20 rwhp at peak, more then 20 past peak (increase your rpm limiter with your tune), but you'll give up some power below 3,500rpm.
Idle's at 550 rpm. You don't need to upgrade the valvetrain at all with this cam. I've got 25,000 miles with it in and no issues but I installed it with 800 miles. If you've got high mileage you may want to upgrade a few things.
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