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Whats the difference between a '0' balanced motor and 28oz. balanced one? Is there any advantage or disadvantage to either?
 

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Zero, or nuetral balance means all the weight to counter the piston/rod weight is in the counter weights of the crank itself. The balance is right where its needed...

28oz or 50 oz imbalance means that the counter weights are lacking that weight, it is added at the end of the crank with material added to the harmonic balancer and flywheel/flexplate.
 

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Neutral balance is much easier on parts, IE: less bearing wear. It is the choice for high rpm engines. External is easier for the OEM's due to machining cost. An external can be converted to internal but the cost varies depending on how many slugs of mallory the crank takes. You can figure labor and cost of metal at around $75 for each piece installed plus the balance. Street motor, save your money. Competition engine, spend the money.

CStraub
 
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