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na ls7 build... is sleeving needed

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Old Jul 9, 2012 | 08:32 PM
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Default na ls7 build... is sleeving needed
So I have a standard bore ls7 that I just picked up. Its got some mystery flat top pistons, lunati pro billet rods, and a lunati crank. My question is is it necessary to re sleeve the block? I plan on maybe running g a 200-250 shot. This is a street driven six speed car.

Thanks for any input
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Old Jul 10, 2012 | 08:12 AM
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Not unless the pistons you have are a much bigger size than can be accepted by the current bore.
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Old Jul 10, 2012 | 09:23 AM
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Pistons are 4.125... ill post pics later
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Old Jul 10, 2012 | 09:50 AM
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Not saying for sure that you can't do it without sleeving but I have quite a few LS7 cores here with cracked cylinders due to higher cylinder pressure and OEM cast iron sleeves.

Those sleeves were not designed for a 200 to 250 shot of nitrous. I know people will think I'm biased because we sleeve but I thought I would respond to this because I see way to many cracked blocks because of this.

Good luck with your build!
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Old Jul 10, 2012 | 09:54 AM
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Originally Posted by ERL Performance
Not saying for sure that you can't do it without sleeving but I have quite a few LS7 cores here with cracked cylinders due to higher cylinder pressure and OEM cast iron sleeves.

Those sleeves were not designed for a 200 to 250 shot of nitrous. I know people will think I'm biased because we sleeve but I thought I would respond to this because I see way to many cracked blocks because of this.

Good luck with your build!
I would agree 100% but thats just IMO and i'm sure we'll hear otherwise...
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Old Jul 10, 2012 | 10:04 AM
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Agree with ERL. I would not push a stock LS7 past about 750 flywheel
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Old Jul 10, 2012 | 10:04 AM
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I'm with ERL. The sleeves are prone to cracking. If it was just N/A I would leave it. With the spray I say sleeve it
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Old Jul 10, 2012 | 10:42 AM
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I don't like hearing this since I was planning 150-200 shot
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Old Jul 10, 2012 | 11:52 AM
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NA you should be fine, but yes I would recommend resleeving with any kind of nitrous/blower/turbo.
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Old Jul 10, 2012 | 11:56 AM
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Building an LS7 based engine is not cheap - why cut corners now. If you can afford new dry sleeves, it would provide a lot of insurance for the future. Last thing you want is to have to build this engine twice.
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Old Jul 10, 2012 | 09:13 PM
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So I bought a disassembled ls7 shortblock below are the pictures of the pistons. I am having a hard time getting info on brand and specs. The numbers on the skirt are

809ts & 28583





Thanks, Nick
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Old Jul 10, 2012 | 09:19 PM
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Darton Wet sleeve it and have some piece of mind.
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Old Jul 10, 2012 | 09:38 PM
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Not interested in putting $3k into this block.... if I stay NA will I have any issues
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Old Jul 11, 2012 | 12:45 AM
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Originally Posted by baggins
Not interested in putting $3k into this block.... if I stay NA will I have any issues
You could sell the ls7 block and buy a resleeved one for close to the same money and have a better block.
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Old Jul 11, 2012 | 05:09 AM
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Whats an ls7 block worth?
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Old Jul 11, 2012 | 07:16 AM
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Originally Posted by delphigto
You could sell the ls7 block and buy a resleeved one for close to the same money and have a better block.
^^^ What he said....
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Old Jul 11, 2012 | 08:13 AM
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TSP sells the LS7 block for $2899.
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Old Jul 11, 2012 | 09:25 AM
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how bout a used LS7 block what's that worth?
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Old Jul 11, 2012 | 09:29 AM
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Any ideas on the pistons?
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Old Jul 11, 2012 | 08:31 PM
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They look like Diamond pistons. I'll give you $1000 for your block.
MrE
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