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Old 06-12-2021, 01:56 PM   #1
amweiner89
 
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Cracked Cylinder Sleeve

Hey guys,

Back again to report on my DOD/AFM delete on an L99. While cleaning up the combustion chambers, I discovered a through and through crack in cylinder number 7's sleeve. See the attached image. In anyone's opinion, should I invest the time and money in getting the whole block re sleeved, which will probably mean new pistons, or do you think it might be a decent time to take a look at just buying a new bare block? I am interested to hear everyone's opinions. I would hope that I might be able to offset some of the cost of a new bare block by selling this block pretty dirt cheap as well as some of the other good components that I will be replacing anyways (i.e., camshaft, etc). I am also not sold on doing anything yet, because I do not really know what options are out there for this unfortunate discovery.

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Old 06-12-2021, 04:58 PM   #2
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That's the exact same reason I bought a low mileage LSA block for my build, I didn't feel like messing with resleeving the block.



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Old 06-12-2021, 06:03 PM   #3
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If I go that route, am I able to re use the rotating assembly out of the L99 if everything is in good shape?
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Old 06-12-2021, 06:09 PM   #4
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What are your intentions with the vehicle? There are a lot of good LS3 crate motor options out there, just depends on how much you want to spend and how much time you're willing to wait if you do a full old school build.
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Old 06-12-2021, 06:15 PM   #5
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Well actually I bought this engine as a dropout from a wrecked 2012 Camaro SS already, and the plan was to swap it into a 69 Cadillac. So basically, a good chunk of change has already been spent on it, and all I was planning to do was delete DOD and drop it in. I am trying to minimize the cost that this problem is going to cause.
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Old 06-12-2021, 06:31 PM   #6
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Quote:
Originally Posted by amweiner89 View Post
If I go that route, am I able to re use the rotating assembly out of the L99 if everything is in good shape?
I bought a short block, so it had the stock LSA rotating assembly which was perfect for my needs. I put in a different cam and oil pump.



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Old 06-12-2021, 06:35 PM   #7
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My hats off to you on the cleaning job. It looks new, except for the crack
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Old 06-12-2021, 06:37 PM   #8
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My hats off to you on the cleaning job. It looks new, except for the crack
Thank you! Nothing like some elbow grease, scotch brite, and WD-40 to bring stuff right back around.

Too bad it ended with me finding the crack...
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Old 06-13-2021, 01:19 PM   #9
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Me personally, I'd sleeve every bore and build it. Sleeve's are going to be much stronger and allow you to run large displacement and still have plenty of wall clearance for strength, and room to bore it again if you ever have another failure. Like always though, it's a balance between wants, needs and budget.
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Old 06-13-2021, 01:29 PM   #10
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I'm not getting why you have to resleeve all the bores and not just the one. I dropped a valve on a 427 last year and the machine shop just pulled that sleeve and put a new one in. I did have to put new pistons in but that was because of damage to several pistons and nicks in the other cylinders.
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Old 06-13-2021, 01:52 PM   #11
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Originally Posted by CamaroCracka View Post
I'm not getting why you have to resleeve all the bores and not just the one. I dropped a valve on a 427 last year and the machine shop just pulled that sleeve and put a new one in. I did have to put new pistons in but that was because of damage to several pistons and nicks in the other cylinders.
Actually, that is sort of my question. I was wondering if I could just do the one cylinder. I think I panicked a little bit because I so far have only called one machine shop and the guy I talked to was certain that I would need to do the one next to it as well, and that they would have to be bored over, which led to him telling me, "can't just do 1 or 2 - gotta do all 8". My plan is to call a few more shops to determine if he was just feeding me a line of BS to maximize the potential service they could be charging me for. I stumbled upon a forum post on LS1Tech where a guy basically had the same problem I do and was able to get just the one fixed.
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Old 06-13-2021, 01:55 PM   #12
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You can do just 1 cylinder to repair it. But your cost is mainly around setup and running the machine to install the new sleeve. Doing just 1 sleeve, isnt really much cheaper than doing all of them, once the machine shop has set up the equipment to do the work. OEM sleeves are cast into the block so they dont just press out. You have to bore them out and press fit in the new sleeve. Then bore an hone to size your pistons and lightly mill the deck.
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Old 06-13-2021, 02:09 PM   #13
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Originally Posted by G8One2 View Post
You can do just 1 cylinder to repair it. But your cost is mainly around setup and running the machine to install the new sleeve. Doing just 1 sleeve, isnt really much cheaper than doing all of them, once the machine shop has set up the equipment to do the work. OEM sleeves are cast into the block so they dont just press out. You have to bore them out and press fit in the new sleeve. Then bore an hone to size your pistons and lightly mill the deck.
So in theory I could re-use the rotating assembly that I am going to now pull out of the block, right?
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Old 06-13-2021, 02:36 PM   #14
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Yes because the new sleeve(s) will need to be fitted to the pistons you're going to be using anyway.
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