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Balancing is always a good idea, but should be concidered a requirement if your using a crank from here, rods from there, flywheel from another place, well you get the idea.
Further more when balancing the crankshaft the harmonic balancer, flywheel and pressure plate should also be done, both kinetically, and dynamically. Remember that just a gram or two at or very near the centerline of rotation will have a relativly small effect on overall balance. However those same few grams 8 inches off from the centerline will turn into pounds in a big hurry.
A harmonic balancer dampens harmonic vibrations, it does not balance poorly matched components.
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