Boring out LS1
Le Mans Master
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From: Guinness Its whats for B'fast JAWGA
CI 3-4-5-9 Veteran
Not cleaning the parts or attached oil coolers, oil lines etc coould get debris in the engine.
You maybe fine with polishing the crank, near berings and maybe a fresh hone on the cylinders.
You maybe fine with polishing the crank, near berings and maybe a fresh hone on the cylinders.
Le Mans Master
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left on crank or bearing and when cranked down damaged the bearing.
Drifting
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From: In the woods
2024 C5of the Year Finalist - Unmodified
I have been researching this as well. As mentioned one cannot bore out the LS1 very much. It is my understanding the absolute max overbore would be 3.905" with 3.903" being the most common size. I am also pretty sure there are no parts interchangeable between old and new small blocks. IIRC lifters and con rod bearings were interchangeable but not sure about that.
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From: Guinness Its whats for B'fast JAWGA
CI 3-4-5-9 Veteran
I have been researching this as well. As mentioned one cannot bore out the LS1 very much. It is my understanding the absolute max overbore would be 3.905" with 3.903" being the most common size. I am also pretty sure there are no parts interchangeable between old and new small blocks. IIRC lifters and con rod bearings were interchangeable but not sure about that.
https://ls1tech.com/forums/generatio...ls1-block.html
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From: Guinness Its whats for B'fast JAWGA
CI 3-4-5-9 Veteran
Racers also need to replace or ultrasonic clean lines and oil coolers if they send debris into the oil circuit.
Drifting
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From: In the woods
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Some blocks can go 3.910. 3.907 is pretty common. You may want to have the block sonic checked especially an earlier block. I'd check with a machinist who regularly works with aluminum LS blocks.
https://ls1tech.com/forums/generatio...ls1-block.html
https://ls1tech.com/forums/generatio...ls1-block.html
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From: Guinness Its whats for B'fast JAWGA
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I think you misunderstood the point of my post, inside the "LS1" blocks there are multiple versions identified by casting number with varying sleeve thickness and accepted max bore.
Further even inside the same casting number, the sleeve thickness can vary. People have taken the 97/98 blocks out further than what was the published max without issue which isn't to say all blocks or sleeves inside the block can.
Further even inside the same casting number, the sleeve thickness can vary. People have taken the 97/98 blocks out further than what was the published max without issue which isn't to say all blocks or sleeves inside the block can.
Drifting
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From: In the woods
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^^ Why I ask questions. This detail I did not know, that there were different sleeves used in the LS1 block, makes sense. Thanks for the clarification. I imagine most cite 3.905" as a max that is safe in all variations of sleeves.