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In 69 if original it would be a forged crank internal balance,
& also as said did you pull the TC and or dampener (either would tell you). Otherwise does the motor look original/untouched? Use your best guess or pull the pan to ID the crank parting lines EDIT & someone did mention that a forged crank (later on) could be external

Last edited by RapidRobert; 10/15/19 07:26 PM.
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