Depends on what seized it. If it was just from sitting, maybe. If it was overheated or ran out of oil chances are dim. Marvel oil has freed some pretty bad cases in my time. Usually though they became oil burners after that. Pulling injectors is the only way to get the MM into the chambers though. Good luck but don't be disappointed. Try to bar it over instead of using the starter. That can snap it off and cause more grief.
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