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Adding 1.8 roller rockers is way more expensive than even an aftermarket cam and it is recomended to change springs with them. With higher ratio rockers you are increasing the ramp rate and adding lift which brings you closer to coil bind. The LS9 cam is a FACTORY CAM and has virtually the same lift as stock but with more duration. I have reved my LS3 with LS9 cam to 6,800rpm without valve float. With the wide lobe separation angle big int/exh split the power doesn't drop off rapidly either. 20hp for less then $200 is a bargain. Now if you have to farm it out forget it. Spend the $600+ and go with an aftermarket cam because you'll be spending more then that on labor. I'm pretty sure the GM "hot cam" with .525" lift will work fine with the stock springs but with such a tight lobe separation angle it will most definitely require a tune.
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