Re: 12si swap to 10si(internally)
The rear housing containing the rectifier should be reused as 100 amp output needs the heavier diodes. the rear half will bolt up to the 10si front housing but you should just change the bearing if that is all that is wrong with it. the bearing is the same in both models or you could buy a new one. the bearing is number 6203 they only cost a few dollars.
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1957 3100
1950 5 window
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