LS4 Performance - 1.8 rockers

Will our cars except any ls motor aftermarket rocker arms or is there special ones I should look for. And how much of a difference does the 1.85s make over 1.8. What springs are you using and is there any other necessary upgrade at the time with rockers. And last what kind of gains are you getting?

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I did search there's no thread on rocker arms.

Delete previous post....and face to palm. I wasn't using the search function properly