Gravely 430 Mower, Lawn and Garden Tractor
A direct replacement complete engine is no longer available for this. The Kohler engine with a spec of 47232 uses a 77 522 21 shortblock, but other specs may use a different shortblock number. This engine has a stepped shaft in it that only Gravely uses. Other tractors used an Onan 12 HP NB.
Additional Info
Here is what the repower kit looks like installed in the tractor:
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