[blucar]

Eight volt systems were used in a lot of vehicles/tractors, etc., during the 1940's/50's.. the added voltage/amperage was a big help in starting engines during cold weather.
I was raised in Eastern Idaho, the winter temps can be 20 below or more, there was no such thing as electric engine heaters, so a good battery was a must have item..
I used an 8v battery in my '36 Ford for many years, even after I had moved to California in '56.. The 8v worked very well on my hopped up engine, plus it gave the car added electric power for the radio, heater, etc.
Never had any problems with any of the accessories, radio, etc.. The only modification required was to adjust the regulator up to 8+ volts..
I should add that my generator is a 42-48 style two brush.. The battery was moved to behind the seat on the passenger side to allow room for the right exhaust pipe and master cylinder.. For many years the battery I used was a long skinny type for a Buick or a forklift..