2002 chevy LS-6 block

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BILL-C
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2002 chevy LS-6 block

Post by BILL-C » Thu May 17, 2018 8:06 pm

I have a block that needs to go .030 over on bore. Multiple piston mfg have shelf pistons. Looking for success \failure stories. Application is n\a road race.
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user-30257

Re: 2002 chevy LS-6 block

Post by user-30257 » Thu May 17, 2018 8:23 pm

Never had a failure other than a cam bearing move a bit.

Have done many 408" and have even put larger sleeves in.

tt 383
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Re: 2002 chevy LS-6 block

Post by tt 383 » Thu May 17, 2018 10:08 pm

I was under the impression the sleeves were thin, and cast in. That means potentially not centered and anything around .010 was max? Common sizes overbores are 3.903/905/908. Interested if their is success going bigger...

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Re: 2002 chevy LS-6 block

Post by user-30257 » Thu May 17, 2018 10:30 pm

Some can and some cant go .030. The ones I sleeved went 4.155.

Why not just .005 over? If it's a new build what's a couple hundred dollars for the right piston? Better than ruining a block then $2500 in parts and labor to sleeve it.

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Re: 2002 chevy LS-6 block

Post by user-30257 » Thu May 17, 2018 10:34 pm

BILL-C wrote:
Thu May 17, 2018 8:06 pm
I have a block that needs to go .030 over on bore. Multiple piston mfg have shelf pistons. Looking for success \failure stories. Application is n\a road race.
Sometimes you can move the bores around to center the piston in the sleeve. If that doesn't work it's time to sleeve it.

What caused the damage to need .030? If it was a failure. Check to see if it's cracked.

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Re: 2002 chevy LS-6 block

Post by CGT » Fri May 18, 2018 12:10 am

I havent personally seen a 5.7 block at .030. Cores are generally too easy to find I guess. I'd wanna sonic checker on that for sure. I assume it wont clean up at less?
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Re: 2002 chevy LS-6 block

Post by user-30257 » Fri May 18, 2018 12:24 am

CGT wrote:
Fri May 18, 2018 12:10 am
I havent personally seen a 5.7 block at .030. Cores are generally too easy to find I guess. I'd wanna sonic checker on that for sure. I assume it wont clean up at less?
For the price of a 6.0 truck core. It's stupid to put the work into a junk aluminum block, unless the customer requests it and knows What the price will be.

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Re: 2002 chevy LS-6 block

Post by CGT » Fri May 18, 2018 10:39 am

Headguy wrote:
Fri May 18, 2018 12:24 am
CGT wrote:
Fri May 18, 2018 12:10 am
I havent personally seen a 5.7 block at .030. Cores are generally too easy to find I guess. I'd wanna sonic checker on that for sure. I assume it wont clean up at less?
For the price of a 6.0 truck core. It's stupid to put the work into a junk aluminum block, unless the customer requests it and knows What the price will be.
I agree with that.
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"Im out!"
"FACT! MOO IMO"

tt 383
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Re: 2002 chevy LS-6 block

Post by tt 383 » Fri May 18, 2018 12:01 pm

I have heard Melling makes a cheap "generic" sleeve that works on ls1, that is good for 4.0 +.030 like an ls2 if weight is an issue. However not sure if ls6 is OK to sleeve with the big windows in the bottom end?

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Re: 2002 chevy LS-6 block

Post by BILL-C » Fri May 18, 2018 1:46 pm

Someone convinced my customer that aluminum ls blocks are not safe to sleeve. Problem is that one of my guys had his head in his rear and set bore gauge wrong and ended up honing the bore too big. My shop, so my responsability to make right, no matter what the cost. New ls-6 blocks are no longer in production and haven't been able to find a good used one yet. Anyone with alot of ls experience know what best option is for a new aluminum block with minimal extra complications? New bare gm ls-3 block seems best option at this point.
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Re: 2002 chevy LS-6 block

Post by user-30257 » Fri May 18, 2018 4:33 pm

BILL-C wrote:
Fri May 18, 2018 1:46 pm
Someone convinced my customer that aluminum ls blocks are not safe to sleeve. Problem is that one of my guys had his head in his rear and set bore gauge wrong and ended up honing the bore too big. My shop, so my responsability to make right, no matter what the cost. New ls-6 blocks are no longer in production and haven't been able to find a good used one yet. Anyone with alot of ls experience know what best option is for a new aluminum block with minimal extra complications? New bare gm ls-3 block seems best option at this point.
Ls3 is your next bet. But you can save the cylinder. You just have to sleeve it.

If you have to eat the cost maybe you can upsell him a 4.200 sleeve kit. It's a lot of work but for what people want these blocks for you might be saving money.

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Re: 2002 chevy LS-6 block

Post by midnightbluS10 » Fri May 18, 2018 9:51 pm

If you could find an L33 aluminum 5.3, they're supposed to be able to accept a .118 overbore with .020 safety margins left in the liners, putting it at stock ls1/6 bore.

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Re: 2002 chevy LS-6 block

Post by BILL-C » Sat May 19, 2018 6:11 am

midnightbluS10 wrote:
Fri May 18, 2018 9:51 pm
If you could find an L33 aluminum 5.3, they're supposed to be able to accept a .118 overbore with .020 safety margins left in the liners, putting it at stock ls1/6 bore.
Anyone with real experience have an educated opinion on what safe minimum iron sleeve thickness is? I have measured the iron sleeve thickness with my sonic checker and the od of the sleeves are sometimes horribly offset from bore.
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Re: 2002 chevy LS-6 block

Post by cuisinartvette » Sat May 19, 2018 5:10 pm

Summit sells a new block I believe. Ls1 anyway-

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Re: 2002 chevy LS-6 block

Post by peejay » Sun May 20, 2018 6:57 pm

Doesn't the LS6 have a better breathing bottom end than the LS1 or truck blocks? For a road race application I'd think that is critical.

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