Welcome aboard with a poll that makes no sense.
B̶u̶t̶ ̶a̶r̶e̶ ̶y̶o̶u̶ ̶t̶a̶l̶k̶i̶n̶g̶ ̶a̶b̶o̶u̶t̶ ̶t̶h̶e̶ ̶l̶a̶r̶g̶e̶ ̶p̶u̶l̶l̶e̶y̶ ̶o̶n̶ ̶t̶h̶e̶ ̶c̶r̶a̶n̶k̶s̶h̶a̶f̶t̶?̶ ̶T̶h̶a̶t̶ ̶i̶s̶ ̶t̶h̶e̶ ̶h̶a̶r̶m̶o̶n̶i̶c̶ ̶b̶a̶l̶a̶n̶c̶e̶r̶.̶
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̶I̶s̶ ̶t̶h̶e̶ ̶h̶a̶r̶m̶o̶n̶i̶c̶ ̶b̶a̶l̶a̶n̶c̶e̶r̶ ̶l̶o̶o̶s̶e̶ ̶o̶n̶ ̶t̶h̶e̶ ̶c̶r̶a̶n̶k̶s̶h̶a̶f̶t̶ ̶o̶r̶ ̶i̶s̶ ̶t̶h̶e̶ ̶p̶u̶l̶l̶e̶y̶ ̶l̶o̶o̶s̶e̶ ̶o̶n̶ ̶t̶h̶e̶ ̶h̶u̶b̶?̶
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̶L̶o̶o̶s̶e̶ ̶o̶n̶ ̶t̶h̶e̶ ̶c̶r̶a̶n̶k̶s̶h̶a̶f̶t̶,̶ ̶t̶h̶e̶ ̶c̶e̶n̶t̶e̶r̶ ̶b̶o̶l̶t̶ ̶i̶n̶t̶o̶ ̶t̶h̶e̶ ̶c̶r̶a̶n̶k̶ ̶i̶s̶ ̶t̶i̶g̶h̶t̶e̶n̶e̶d̶.̶ ̶L̶o̶o̶s̶e̶ ̶o̶n̶ ̶t̶h̶e̶ ̶h̶u̶b̶ ̶m̶e̶a̶n̶s̶ ̶r̶e̶p̶l̶a̶c̶i̶n̶g̶ ̶t̶h̶e̶ ̶b̶a̶l̶a̶n̶c̶e̶r̶.̶
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Never mind all that - took your motor to be a Mercruiser.
Starting over - What's the serial number of the motor?