The Stovebolt Site Forums The Shop Area The Electrical Bay how do I know if it's still 6v or 12v?

You have a later model motor for sure as that is positively a 12 volt starter. That starter and solenoid were NEVER used on any 6 volt applications. Actually thats not even a late 50s early 60s starter unless its out of a car. That style of starter was not used on Chevy trucks until after 1961.