I haven't seen or heard of a eight volt car battery in years I use to use them in the early 6 volt V8 cars like the pre 1953 Olsmobiles, Cadlilacs and so on, any 6 volt hard starting V8 was a potential benifactor of the extra two volts

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)