2002 chevy LS-6 block

[BILL-C]

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.

[user-30257]

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]

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...

[user-30257]

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.

[user-30257]

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.

[CGT]

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?

[user-30257]

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.

[CGT]

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.

[tt 383]

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?

[BILL-C]

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.

[user-30257]

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.

[midnightbluS10]

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.

[BILL-C]

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.

[cv67]

Summit sells a new block I believe. Ls1 anyway-

[peejay]

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.