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Generation III Internal Engine 1997-2006 LS1 | LS6
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5.3 block

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Old 10-26-2009, 10:48 PM
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Default 5.3 block
How large can you bore a 5.3 steel block and live?
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Old 10-27-2009, 01:10 AM
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it's iron not steel, and it's not worth it when you can get a 6.0 liter block cheaper than it would cost to bore the 5.3 block
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Old 10-27-2009, 08:50 AM
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It can be bored safely to 3.898-3.905(the same bore as an LS1 or 347 respectively). I've heard of people taking them further but I wouldn't recommend it.
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Old 10-27-2009, 11:53 AM
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Get an LQ9, LQ4..6.0l is better.
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Old 10-27-2009, 11:59 AM
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I think the highest you can go with the lq9/4 block is 408 or maybe to 413 right?
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Old 10-27-2009, 02:20 PM
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Originally Posted by BlownChevySS
I think the highest you can go with the lq9/4 block is 408 or maybe to 413 right?
You can go higher displacement with an iron 6.0L, like 427ci, but bore wise ~4.060" is generally thought to be the limit.
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Old 10-27-2009, 02:35 PM
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Originally Posted by KCS
You can go higher displacement with an iron 6.0L, like 427ci, but bore wise ~4.060" is generally thought to be the limit.
I was just talking about with the bore, not stroke, pistons, and deck clearances. But thanks for the insight.
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Old 10-27-2009, 03:13 PM
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Originally Posted by BlownChevySS
I was just talking about with the bore, not stroke, pistons, and deck clearances. But thanks for the insight.
Huh?

408ci and 413ci are both with stroke though, same as 427ci. 370-375ci are with bore only though. All of that has to do with pistons.
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Old 10-27-2009, 03:22 PM
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Originally Posted by KCS
Huh?

408ci and 413ci are both with stroke though, same as 427ci. 370-375ci are with bore only though. All of that has to do with pistons.
Sorry. I was horribly misinformed then.
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