Most of these "Valve spring only" LS1's also have a rocker ratio change, which dramatically changes valvetrain effects, having the effect of a higher lift cam with a faster opening/closing ramp.
I have seen these make up t0 16rwkw on an LS1, and because of power to weight, thats the equivalent of 25rwkw in a Boss. so its good for a couple of tenths........
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