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nah... silviaboy has it right. you balance and spec everything to exactly the same tolerances so everything is the same. the basic way to look at it is this. take the block that's been balanced and blueprinted and the block that's factory new stock and set them both on a motor stand. grab the balanced and blue printed block's crankshaft and you can spin it freely and it will free spin for a good little while as well. the factory put together block will hardly move. and it will not spin freely. does that make sense?
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