Think you nailed it. bearings are the same on the OD .050 difference on the ID for small diameter rod journals compared to big diameter cranks. Only difference besides the cranks is thinner or thicker bearings. Don't hold me to it but if I remember correct the mains are .060 bigger on the late crank. 49 came with a small journal, in case it was changed a crank casting number ending in DC or lower is a original small journal.
Re: engine bearings in reply to BillOHIO, 08-19-2013 17:26:14
278049 is the last engine serial number they used the smaller diameter crank with the thicker bearings. Lots of people think that's tractor serial numbers and get mixed up. Bigger diameter crank started at engine # 278050 and tractor # 291050.
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