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Old 09-24-2010, 04:59 PM
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Need some quick answers on a Craked Block...

My number 6 cylinder has a small crack. Its a 383. Was thinking about having it sleeved. Any Opinions on this will it be okay. I will be pushing around 450hp to the wheel, with an occasional 100-150 nos.



Oscar

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Old 09-24-2010, 05:36 PM
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Quote:
Originally Posted by obengston
My number 6 cylinder has a small crack. Its a 383. Was thinking about having it sleeved. Any Opinions on this will it be okay. I will be pushing around 450hp to the wheel, with an occasional 100-150 nos.



Oscar
This shouldn't be a problem, but you need to take to a competent machine shop and have them take a look.

Just out of curiosity, where is the crack on the wall and what rods are you running?

Bogie
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Old 09-24-2010, 06:30 PM
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Quote:
Originally Posted by obengston
My number 6 cylinder has a small crack. Its a 383. Was thinking about having it sleeved. Any Opinions on this will it be okay. I will be pushing around 450hp to the wheel, with an occasional 100-150 nos.



Oscar
Done right a sleeve in a 350 block is not a problem, BUT the machine shop needs to be careful in doing it, as the sleeve can cause some distorsion in the cylinders next to the sleeved one.
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Old 09-24-2010, 06:49 PM
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The crack runs up/down the cylinder about 2-3 in from top. I'm rinning 6" forged rods w/mahle pistons
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Old 09-24-2010, 06:50 PM
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You may want to sonic test the cylinders before you dump any money into your block, And measure cylinder 4 and number 8 to see how round they are after the sleeve is put in.
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Old 09-24-2010, 07:06 PM
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My opinion is a little different; a cracks a crack, and as noted by another poster, it can stress the adjacent cylinder walls. The only block I had sleeved, was one that had had a broken ring that worn a too deep a groove in the wall. All the cylinders were rebored after. You should be able to locate another 350 block and have it bored to your size; the cost should probably be within $150.00 difference. Sure, most anything can be repaired; your crack sounds fairly long, and does it extend into the bottom end webbing?
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Old 09-24-2010, 07:35 PM
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No its only abot 1-2" about 2" down from top. The block was not to long agong set up/ machined for the stroker internals. So I would have to get another block have it bored and clearanced for the 383 stuff, but if I can sleeve it, and it be just a strong then it will sane some money. But if its going to cost me in the long run then....
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Old 09-24-2010, 09:37 PM
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I sleeved a block for a dirt circle racing 383. It worked great! But....but...it cost me the same as getting a block bored.

sbc blocks are cheap, i would go get a new one, cause you do have a fracture in the block. Think about how much stress that thing is under, now that its fractured, its only going to get worse over time!
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Old 09-25-2010, 10:55 AM
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When they sleeve them is the whole cylider removed and a "NEW" cylider installed?? Not for sure what happens.
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Old 09-25-2010, 01:38 PM
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I couldn't find a good video of a Chevy being done, the first one shows a Chevy, but does not show the sleeve being pressed into place. The Subaru video shows the process, but it is a little different configuration of motor/sleeve. Both of them together should give you a pretty good idea....
http://www.youtube.com/watch?v=vd3Q4S9oP14
http://www.youtube.com/watch?v=SIgq2...eature=channel
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Old 09-25-2010, 01:44 PM
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I wouldn't mess with a cracked block, SBC's are a dime a dozen...even if you have to redo the machining you will be happier and rest easier every time you hit the nitrous button.
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Old 09-25-2010, 03:43 PM
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Here's a video on how to do it! http://www.youtube.com/watch?v=3O4AwJwMG0E&NR=1
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Old 09-26-2010, 10:26 AM
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Well seems I would be okay if I get a good machinist, but would be better off getting a new block..... Well just had all this work done to this block, so now if I buy a new one have all, the work done for the stroker package ect looking at another 4-600 maybe, but have the piece of mind knowing its just like the one I put in there.... or have it sleeved for alot less. There seems to never be a right answer for this hobby lol...
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Old 09-26-2010, 10:59 AM
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one of my friends ran 383's for a good while at the drags.he sprayed his too. kept breakin blocks.changed to a 400.hasnt run it at the track yet but the 383's wouldnt take it.
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