Not all tractors are the same. Subsequently, what works for one specific tractor may not work for another.
What IS the same it this. An 8 volt battery won't last or charge properly unless it's getting 9 volts or higher. An "8 volt" battery is actually closer to 9 volts when charged.
Most 6 volt systems when working correctly go no higher then 8 volts, i.e. one volt TOO low. 8 volts will not charge an 8 volt battery.
If you can "tweak" the regulator a bit and get 9 volts, then it'll be fine. If you cannot get it above that 8 volt charge voltage, it will NOT work.
We installed 8 volt batteries on many old farm tractors - and some worked well, and some not at all.
Regardless if you've got a 6 volt, 8 volt, or 12 volt battery - if they are equal size and weight - they have the same basic power - although the 8 volts versions tend to have the least wattage. If you raise the voltage, you "rob Peter to pay Paul", so to speak. You get faster cranking, but less cranking endurance time. The higher cranking voltage is, the faster the engine turns over.
Here are three batteries basically in same-size and weight packages . . .
6 volt - 6.45 volts when fully charged BCI #1, 8 15/16” long by 6 3/4” wide by 8 3/4” tall. 670 CCA @ 4.5 volts, RC 135, 31 lbs. wet, 3000 watts at zero degrees F.
8 volt - 8.6 volts when fully charged BCI #1, 9” long by 6 7/8” wide by 8 3/4” tall. 430 CCA @ 6 volts, RC 110, 31 lbs. wet 2580 watts at zero degrees F.
12 volt - 12.9 volts when fully charged BCI # 75, 9” long by 7 1/16” wide 7 1/4” tall. 625 CCA @ 9 volts, RC 115, 33 lbs. wet, 5625 watts at zero degrees F.
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