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Old 10-15-2008, 07:22 PM
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Cracks in lifter valley

Ive got a sbc with hairline cracks in the lifter valley across each cylinder water jacket. These showed up when magnafluxed. They showed no signs of leakage when the motor was torn down. I hate to get rid of the block because it is out of my anniversary model corvette. Can this be repaired and how expensive is it?

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Old 10-15-2008, 07:38 PM
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Spankdaddy,

These cracks are from the block freezing in cold weather. I would not try to fix this because when you tighten the head bolts these cracks will pull apart and leak. I understand you want to keep the block but it is not worth throwing money at, just to have it leak at a later time causing more ruined parts and more down time. Junk it and find another block.

Sorry
Scholman
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Old 10-15-2008, 07:49 PM
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I have seen quite a few of the later one piece rear seal blocks stress crack above the lifter bores. Usually toward the rear and up a couple inches. Running at an angle across the surface.

I have drilled the ends of the cracks, V-eed these cracks out, heated the block to about 500 degrees and welded the blocks. But, this is not something most shops can do. Also a bit spendy if you have a blacksmith do it.

Another block would be cheaper, unless you really need the matching numbers
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Old 10-15-2008, 07:57 PM
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Toss it and don't look back, SBC's are a dime a dozen...its not like this one is serialized to your vehicle anyway.
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Old 10-15-2008, 09:03 PM
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Actually, if it's the original motor out of his Corvette as he implies, it IS serialized to that car. But I do agree that it would be better to just replace it. By the way, which "anniversary" year is it?
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Old 10-16-2008, 08:00 AM
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Check into lockstich crack repair this is a common repair for this condition.
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Old 10-16-2008, 08:25 AM
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What year of corvette are we talking? If it needs decked chances are there gonna remove the VIN anyway. Find a block with the same casting #'s have it decked to 9.000" and no one will know the differance.
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Old 10-16-2008, 08:56 AM
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Quote:
Originally Posted by barnym17
Check into lockstich crack repair this is a common repair for this condition.
This is the website that I think will have the info that barnym has said will work:

http://www.locknstitch.com/

I do agree that unless this engine is not serial numbered to the car, that a replacement block is the way to go.

Dave W
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Old 10-16-2008, 10:02 AM
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One point everyone is ignoring is the engine was running fine and not leaking. How likely are the hairline cracks to begin leaking after a rebuild? How likely are they to get longer, larger and begin to leak years down the road? Just asking, as I stay as far away as possible from later SBC.

thnx, jack vines
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Old 10-16-2008, 12:11 PM
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Quote:
Originally Posted by Irelands child
This is the website that I think will have the info that barnym has said will work:

http://www.locknstitch.com/

I do agree that unless this engine is not serial numbered to the car, that a replacement block is the way to go.

Dave W
We have repaired alot of cracked blocks with the lock-n-stitch method with great results.

Check out this guys work as I consider him and artist as we has a block that he had done and I would say frank repaired about 5 feet of cracks.
http://speedtalk.com/forum/viewtopic...ighlight=casey
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Old 10-16-2008, 12:45 PM
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Quote:
Originally Posted by Spankdaddy
Ive got a sbc with hairline cracks in the lifter valley across each cylinder water jacket. These showed up when magnafluxed. They showed no signs of leakage when the motor was torn down. I hate to get rid of the block because it is out of my anniversary model corvette. Can this be repaired and how expensive is it?
This is pretty common, if you chased every crack in a casting you'd go nuts. If they're not leaking and you don't lean on the engine for lots of power all the time, just ignore them.

Bogie
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