Generation III Internal Engine 1997-2006 LS1 | LS6
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Head bolt way too long

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Old May 25, 2017 | 06:04 AM
  #41  
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That would be a Ls6 block. Also Ls6 block will not have the indent markings that I have identified by Green arrows on my block. Below the green dots




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Old May 25, 2017 | 06:22 AM
  #42  
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04+ Ls used all shorter (4") head bolts
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Old May 25, 2017 | 07:42 AM
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can you confirm what block this is with these photos?
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Old May 25, 2017 | 07:49 AM
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I thought you had the casting number 12561168 ? Which would make it a Ls6 block. Also with all the head bolts being the 4" that makes it 04 or newer Ls6.

It also does not have the indents I pointed out in my picture that ls1 blocks have but Ls6 blocks do not, like yours.

If I had to guess I would say it absolutely is a Ls6 block from 2004 or newer.
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Old May 25, 2017 | 07:53 AM
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Originally Posted by 98CayenneT/A
I thought you had the casting number 12561168 ? Which would make it a Ls6 block. Also with all the head bolts being the 4" that makes it 04 or newer Ls6.

It also does not have the indents I pointed out in my picture that ls1 blocks have but Ls6 blocks do not, like yours.

If I had to guess I would say it absolutely is a Ls6 block from 2004 or newer.
good to hear, thank you!
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