The balance of any engine , and its harmonic periods awe well known to the engine builder.
I suspect the Ford Econo Power engine were balanced TO have their noise under 1000 RPM as it is not common for farm implements to operate at idle.
Should someone be doing a TOTAL rebuild , after the crank is straightened go and have ALL the moving stuff balanced.
Front shive and damper, crank and flywheel, pistons weight matched and rods checked for straight and equal weights end for end.
This is done on most high performance engines , and will cost under 1/2 a boat buck.
The difference in SMOOOTH will be felt , esp if the usual operating RPM is known to the engine balance shop.
Bigger engines have a damper on the front of the crank, no Idea if Leman does , but these wear out or rot .
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