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Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 05-29-2009, 10:23 AM   #1
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Can someone tell me the benefits of the following mods, how they work exaactly and whats involved in the install?

Mods in question: 1.9:1 HS roller rockers and 105# valve springs
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Old 05-29-2009, 11:02 AM   #2
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Stock rockers are 1.6:1 so installing 1.9:1 rockers will open the valves further and a little bit longer. This allows more air to move threw with less effort. Stock valve springs are 60#, so installing 90# or 105# springs allow the valves to close faster, this is needed when running at higher RPMs such as 6000 rpm shift points. With stock springs you risk valve float.
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Old 05-29-2009, 11:18 AM   #3
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ok makes sense. So what is involved in replacing those? I imagine the sc has to come off in order to get to the rocker housing yes?
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Old 05-29-2009, 11:19 AM   #4
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Nope, Valve covers are all you need to get to the rockers.
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Old 05-29-2009, 11:21 AM   #5
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Rockers are one of the easiest things to change, springs are a bit more involved. Here'* a write up.

https://www.gmforum.com/t278815/
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Old 05-29-2009, 11:22 AM   #6
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THanks guys
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Old 05-29-2009, 11:22 AM   #7
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Yep...look up. Dan linked ya.
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Old 05-29-2009, 11:35 AM   #8
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Is there any tuning needed with this mod, and /or supporting mods that would aid in performance?
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Old 05-29-2009, 11:37 AM   #9
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Tuning will help, but not needed. Rockers, springs, and pushrods all go together. Pushrods are optional.
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Old 05-29-2009, 11:46 AM   #10
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Good deal. I've said it before, u guys are clutch. I may actually do this mod after i finish my pully swap.
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