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2007 Silverado W/ ls6 castings

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Old May 4, 2008 | 09:46 AM
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Default 2007 Silverado W/ ls6 castings
I didnt realize that the new 4.8's had ls6 castings I guess that is where the power bump comes from. Did they all come like that or just some of them?
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Old May 5, 2008 | 08:57 AM
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Come on someone has some insight on this.
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Old May 5, 2008 | 09:12 AM
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As far as I know they all came like that. I believe they are using 2 casting #'s, but both are pretty much the same. I know my 07-4.8 has the 243's
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Old May 5, 2008 | 09:24 AM
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I Have A Set Of 07 4.8 Heads Will They Help Out A 02 5.3l.... The Casting # 799, But Will It Work Better Than the 5.3l head For The Cam Swap, vinci 045 216/224...
Thank,
Last edited by 02burban; May 6, 2008 at 08:29 AM. Reason: updating
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Old Oct 18, 2009 | 04:32 PM
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the 243s are the exact same as the 799. Most have a 243 on one side and a 799 on the other.
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Old Oct 18, 2009 | 04:38 PM
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Originally Posted by 02burban
I Have A Set Of 07 4.8 Heads Will They Help Out A 02 5.3l.... The Casting # 799, But Will It Work Better Than the 5.3l head For The Cam Swap, vinci 045 216/224...
Thank,
Yes, they will help out. As i understand they are the heads gm used on the c5 z06, but theyre milled to bring compression back up.
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Old Oct 18, 2009 | 04:43 PM
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Originally Posted by casey.shoemake
Yes, they will help out. As i understand they are the heads gm used on the c5 z06, but theyre milled to bring compression back up.
I dont think they are milled. They're 64cc. They used flat top pistons.
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Old Oct 18, 2009 | 04:57 PM
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Originally Posted by GMCtrk
I dont think they are milled. They're 64cc. They used flat top pistons.
ahh, ok. So are they the same as z06 heads with the exception of valves, and springs. Both 64cc and both flow the same?
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Old Oct 19, 2009 | 11:42 AM
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Originally Posted by casey.shoemake
ahh, ok. So are they the same as z06 heads with the exception of valves, and springs. Both 64cc and both flow the same?
Correct.
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