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  #1  
Old 07-24-2003, 02:58 PM
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6 packin 6 packin is offline
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Default 440 crank in a 400 block balancing questions?

I have a pretty much gone 440 crank (steel) that has been turned and has had bearings spun. Its pretty much junk, but I aslo have a late 70's 400 block laying around too. Just wondering about the balancing on these combo's using the off the self KB pistons available. And did they need mallory added to it when balanced? Im not sure of what rods I will be using probably production 400 rods, for less weight, compared to the much longer rod of the 440.
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Old 07-24-2003, 04:23 PM
John Kunkel John Kunkel is offline
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A good read on the subject:

http://www.arengineering.com/articles/frame1.htm
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Old 07-25-2003, 04:21 AM
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biggerhammer biggerhammer is offline
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Default 440 crank

you can't have the steel crank built back up and re-ground?
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Old 07-25-2003, 06:36 AM
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lenweiler lenweiler is offline
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I did that exact combo. No mallory was needed. Just cut the mains to suit the 400 block.
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Old 07-25-2003, 12:18 PM
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Slingshot383 Slingshot383 is offline
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You cut the mains to 400/383 specs, and cut the counterweight diameter down to I believe 7.25", and using either a 440 or 400/303 length rod (depending on what compression heigth you want) that it balances out quite nicely. Another thing you could do is turn the rod bearings down to Big block Chevy size 2.2" and us an off the shelf 6.535" rod.
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Old 07-25-2003, 01:56 PM
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Default Re: 440 crank

Quote:
Originally posted by biggerhammer
you can't have the steel crank built back up and re-ground?
Just wondering what you ment? Stock 440 mains measure 2.75 and 383/400 are 2.38 so it will be turned down anyway. I think the rods are .020 under now but dont look to bad , they should go .030 no problem, bearing sizes should be available for this.
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Old 07-25-2003, 10:34 PM
jelsr jelsr is offline
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The KB's are a bunch lighter than the stockers and the counterweights are heavier than those on a cast crank so balancing is not a problem with either rods.
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