LS3 intake rocker arm problems?
Thread Starter
Le Mans Master
Joined: Dec 2005
Posts: 6,999
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From: Southeast TX
LS3 intake rocker arm problems?
Just wondering if any of you who have installed aftermarket cams (higher lift than stock) have had trouble with the stock offset intake rocker arms. I remember reading about bearing problems with the LS7 offset rocker arms. My LS3 has about 25K on the clock. About 20K of its miles have been with stiffer springs and .600 + lift cams. There's a company that will upgrade the bearings in your stock arms for a reasonable fee. The co. name escapes me. I'm wondering if I need to upgrade before problems occur.
Safety Car
Joined: Jun 1999
Posts: 3,570
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From: Austin, Singapore, Kuala Lumpur, Houston, Dallas, Hong Kong, Elgin, etc.. Texas
Just wondering if any of you who have installed aftermarket cams (higher lift than stock) have had trouble with the stock offset intake rocker arms. I remember reading about bearing problems with the LS7 offset rocker arms. My LS3 has about 25K on the clock. About 20K of its miles have been with stiffer springs and .600 + lift cams. There's a company that will upgrade the bearings in your stock arms for a reasonable fee. The co. name escapes me. I'm wondering if I need to upgrade before problems occur.
I have a high lift cam and was always concerned about the stock rocker arms so I did some research.
I found a number of experts that said stock rocker arms are only good to .550" then the geometry becomes an issue. Too much side thrust which causes excessive valve guide where.
When I removed my stock rocker arms I found a couple had grooves where they were digging into the very outside edge of the valve stem. Here is a photo of one.
So, they recommended full roller rocker arms such as Jesel, Yella Terra, or others.
Last edited by Mez; Jul 25, 2010 at 07:14 PM.
