From experience in automotive, if the flywheel only goes on in one position, then I would bet money it is balanced to the crank/flywheel position. If you have the assembly custom balanced, there will be no issue as they will either add or remove from the flywheel and or crank to zero it. I don't know those engines, but it will be one of 2 balancing types, one internal, where the crank is balanced and the flywheel is neutral, the other external, where the flywheel is balanced for the internal parts. you cannot switch flywheels from internal to external balanced engines without re balancing the whole assembly
did that make sence?
Andrew
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1943 White M2A1 Halftrack (converted from an M4A1)
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