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Problem with switching out just the bearings is that there is no way to tell if the crank journals (i think thats the part that makes contacts with the bearings) is out of round unless the crank is taken out and sent to a machine shop for resurfacing.
If the rod journals are even just slightly out of round... The new bearings will last much less than before... The clearances are so small to begin with that if anything is off then you are waisting money.
Doing a quick google search on rod bearing replacement for other cars... If just replacing the rod bearings its recommended to get rod bearings with slightly more clearance to compensate... But there are no replacement bearings that have slightly more clearance so the only option is to machine down the crank journals to proper clearances.
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