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Side by side the PRC CNC Ported LS3 heads add roughly 25rwhp. If you look at people that dyno before & after the heads that's very typical of the gains.
You can't really just read a few dyno sheets & determine what works, there are just to many other factors. I would look for before & after dyno sheets.
If your wanting more we are working on PRC aftermarket casting LS3 heads currently. They ship with smaller runners, smaller chambers, and larger head flow! Expect near 40rwhp to be possible with these heads!!
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