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Old 01-29-2006, 07:32 PM
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uhh ohhh problem - need professional machinist opinion.

I have a block that needs a 30 over bore.. but i have a pretty big problem. one of the cylinders has a VERY thin wall at the end of it. about an 1/8 inch thick.



Do you think it can be bored? or will this block be scrapped...

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Old 01-29-2006, 07:49 PM
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Definitely another block.

It is bad at 6 oclock, and looks thin at 8 oclock. I don't think that I would spend $ 100 on a sleeve.
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Old 01-29-2006, 07:57 PM
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that is a bummer... need to locate a block quickly.
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Old 01-29-2006, 08:08 PM
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Quote:
Originally Posted by xntrik
Definitely another block.

It is bad at 6 oclock, and looks thin at 8 oclock. I don't think that I would spend $ 100 on a sleeve.
I would take it to a local machine shop that you trust and ask them. Maybe they think aTHICK sleeve will be supported alright.
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Old 01-30-2006, 06:04 AM
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Turn the block over and look at where the lifter bores are in relation to the casting around them. They should be fairly centered. If they're not then the whole block has bad case of core shift and shouldn't be used.
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Old 01-30-2006, 07:15 AM
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block

It's really tough to tell from a picture but it looks like the area you are talking about is below the cylinder box. I think its below the coolant and the structual part of the block. Many blocks are like this and present no issues with over bores... Take it to the machine shop and have the guy look at it before you junk the block and start looking for a new one...

Me personally i have never seen any block that could not be bored .030" over??? Is this some odd block??? Or is it just a ford ,chevy or mopar production block????

Keith

Last edited by k-star; 01-30-2006 at 08:55 AM.
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Old 01-30-2006, 08:45 AM
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I agree with Kstar, looks to me like it is well below the point of maximum stess.

Vince
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Old 01-30-2006, 09:38 AM
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Definitely take it to a machine shop and have them look at it. If you're building for max power and planning on a blower or nitrous, it might be iffy, so make sure you tell them your intentions. If it's a mild rebuild, 1/8" thick cylinder walls should be fine.
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Old 01-30-2006, 11:08 AM
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That block appears to be thin well below where it really matters. Nearly all blocks are thin there.
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Old 01-30-2006, 11:41 AM
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Looks like a pretty typical block to me. As several have pointed out it is in the crank area and many, many blocks look that way. For those that are suggesting it is junk from the picture, you might take a minute and look in the crank area of a block. I've bored many a block that looked similar in the same area. I would let the machinist make the call, they can tell better than any single pic could represent.
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Old 01-30-2006, 02:02 PM
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That block is typical of all SBCs. There is no water jacket around the cylinder at that point (#8 cylinder) and it is not a stressed area. The later blocks that are designed for roller lifters have more metal built in in that area, but your block is not adversely affected. You can use a die grinder to grind away the sharpest portion.

Again, it's not a problem.

tom
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