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double e my back side... 8 volt work well... tweak up the voltage on the requlator and they charge perfect... they have the effect of spinning the motor faster.... meaning with the up draft carb...they pull more vacum... meaning that the mixture is delivered to the engine quicker... starting with less cranking.... they were particually good on the bigger engines with higher compression when hot.... lots of these engines suffered from "heat lock " on the starters from the combination of high comrpession and the starter being heat-soaked... take that in to account with the low pressure fuel systems where you could boil the gas in the gas line ending up with a vapor lock on top.... double e my butt.... if you knew two cents worth about up draft/vaporlock/heatsoak and trying to usa a battery that over a year old ... cranking a half turn at a time due to lack of power,,, trying to pull 300 amps through an old wiring system... then take the extreme cold where the fuel vaporization is none existant and heavier than air and try to suck that up a up-draft system ... with slower cranking, higher viscosity oil, and reduced power from the battery,,, the extra 2 volts will make it spin over nicely.... quickly... and deliver a good spark... so for years... yes years... the 8 volt was the answer..... for many farmers and city folks alike ... but then 12 volts came along... further allowing power with reduced current..... so unless you want to convert it... 8 volts is an excellent way to go with only a regulator adjustment required.... no, it will not fix low compression, but will help start low compression where 6 volts will not... yes you can convert it to 12 volts with great results but you have to change out all much more... or simply run 8 volts with a regulator change....
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