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Unknown Crankshaft

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The 850 engine I'm rebuilding came from a machine where the engine was bolted solid into the frame. How would I be able to tell whether it has had it's balance factor altered?

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There would likely be a number of additional holes bored into the flywheel and maybe the big-end counterweights too.  Existing holes might also have been weld-filled.

The attached photo shows my original factory balanced Mk3 crank with just two holes drilled into the flywheel.  Of course, other cranks may have needed more, but not many I would suggest.

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