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Old 06-23-2011, 06:18 PM
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400 sbc bore or sleeve

I droped my 400 off at the machine shop to have work done to it but there was one cylinder that they were not sure if it would clean up on 30 so might have to take it to 40 over, my question is should I have them go ahead and bore all to 40 if that one cylinder doesn't clean up on the 30 or if it won't clean up on 30 have them sleeve that cylinder and have all cylinders to just the 30 over?
I would like to get the most out of this motor as around these parts their extinct.
Thanks

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Old 06-23-2011, 07:46 PM
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Depends on if you already have pistons and how much money you want to invest in a block. I personally would go with .040 and just keep my eye open for another block for future work.

I don't like sleeving 400 blocks. Unless it is to save a damaged cylinder in a prime block. 400's have enuff problems with deck cracking and a sleeve, even done properly, can invite cracking into head bolt holes.
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Old 06-24-2011, 06:19 AM
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Quote:
Originally Posted by BOBCRMAN@aol.com
Depends on if you already have pistons and how much money you want to invest in a block. I personally would go with .040 and just keep my eye open for another block for future work.

I don't like sleeving 400 blocks. Unless it is to save a damaged cylinder in a prime block. 400's have enuff problems with deck cracking and a sleeve, even done properly, can invite cracking into head bolt holes.
X2 On 400 blocks if they are going to be used for a performance application they should be sonic tested for cylinder wall thickness and plate honing is a must on those weak blocks.
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Old 06-24-2011, 11:07 AM
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Well unfortunately this weak block is the only one I can afford, maybe one day I will be able to get a Dart block and build one from there. I will just hold off on the sleeving and hopefully it will just clean up on the .030 over, they just wasn't sure until they actually started boring it.
I do appreciate the replies,
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