I am thinking of doing a set of rocker arms on my '04. Has wnyone done them yet or had them done? Do you need to retune afterwards? And what are the best ones. I got a price of $540. for the arms and $150 for HD pushrods. All from comp cams. The motor it stock just an intake.
From what they claim Crane says 15-20hp. And they work the best w/ their quick lift cam. Not that I want to get into doing a cam. I plan on running the car at cecil county one more time before the install. Then maybe a week after.
I would do the springs also.
Adding larger ratio rocker arms increase lift and have minimal effect on duration because you are opening the valve sooner than it was before. I don't know what the stock lift on the ls1 off the top of my head but you can multiply it by 1.7(stock) to find out and then multiply 1.8 and that will give you how much approx lift you had gained.
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