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Generation III Internal Engine 1997-2006 LS1 | LS6
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new 5.3 block was told its an ls-6 with smaller sleeves true or not ?

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Old 02-16-2011 | 06:51 PM
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Default new 5.3 block was told its an ls-6 with smaller sleeves true or not ?
anyone know if this is true + what they can be safely be bored too
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Old 02-16-2011 | 06:56 PM
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most 5.3 blocks were iron when the ls6 block was in production, so I am going to say thats false... although I could be wrong.
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Old 02-16-2011 | 07:11 PM
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its the new alu. truck block. so i'm told
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Old 02-16-2011 | 07:21 PM
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I read that you could resleeve it to a 5.7 bore, but not sure if they are the "same" block.
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Old 02-16-2011 | 07:26 PM
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was told the sleeves are just thicker and could bored safely to 383. no resleeve just bore them.
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Old 02-16-2011 | 08:03 PM
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Originally Posted by formula c3
was told the sleeves are just thicker and could bored safely to 383. no resleeve just bore them.
http://www.ls1.com/forums/archive/in...p/t-44289.html
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Old 02-16-2011 | 08:29 PM
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Originally Posted by kinglt-1
That info is false, you can go to 3.905" on those aluminum 5.3L blocks.
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Old 02-16-2011 | 08:44 PM
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I have a 5.3 aluminum truck block bored to 3.905.
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Old 02-16-2011 | 09:08 PM
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I have a 5.3 HO block and a 97' LS1 block and the OD of the sleeve in the 5.3 block is BIGGER! So yes, 3.90" bore is no problem.
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Old 02-16-2011 | 09:36 PM
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great thread,I would like to find a block like that for a 383 build.dose this 5.3 block have windows cast into the lower block?what yrs and casting number.
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Old 02-17-2011 | 09:09 AM
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Good info thanks for clearing this up! I found lots of different answers in different threads I searched...
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