harmonic balancer

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It's like telling us you're 6' tall and asking us what size shoe you should wear. We can guess but there's no way to know for sure.

You probably will use a 50 oz imbalance balancer and fly, but the only way to know is to ask your engine builder what imbalance he built the motor to.
 
i could be wrong, but from what i've gathered it depends on what style crank you have. stock crank = 50 oz imbalanced. just make sure the flywheel has a 50 oz imbalanced weight on it as well.