Light bulbs will be brighter but won't last nearly as long. Points may also burn a little faster but probably aren't a big deal unless you're using the tractor every day.
If you have an actual voltage regulator it'll have to be adjusted to charge an 8 volt battery. If you have a cutout relay, it'll charge an 8 volt battery, just not as fast as a 6 volt one. A 6 volt regulator will limit generator output to about 7.2 - 7.5 volts, not enough to charge an 8 volt battery.
A cutout relay simply disconnects the battery from the generator when its not running, but doesn't limit the output voltage of the generator.
Generally, an 8 volt battery is an attempt at a quick & dirty patch job instead of fixing the actual problem. You don't say why you want to change, so we can't offer any suggestions to make sure the existing 6 volt system works the way it should.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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