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I don't know how many SBs I have seen/disassembled for over 35yrs, but this seems to almost be random. If you are going to do a total rebuild which will include balancing, it will not matter if they are numbered. When everything is finish machined/balanced, you are starting from scratch.

While we are on the subject of rebuilding a SB400, I would really encourage you to replace the stock shorter 400 rods with a set of stock 350 rods which are longer. The extra length will help build a little extra power in the upper rpm range. Pistons for SB400s with the longer 5.7 rods are now just a tiny bit higher than regular 400 pistons. Depending on what you get (I really prefer the Federal-Mogul hypereutectic), you're probably looking at $10-40 more. everything else will be the same price as a regular 400.

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Tom Parsons
 

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That's all you need, Keane. What they will do is weigh and grind metal from the rods so they all weigh the same---on each end.

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Tom Parsons
 
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