You will thoroughly enjoy a 6 volt starter fed by a 12 volt battery. If the 6 volt starter is new or properly rebuilt, you won't have any issues running it on 12 volts. It will turn your engine over like nobody's business and start right away.
If you have a 6 volt starter with worn bushings and rough/dirty commutator, that starter will not like 12 volts for very long (those don't like 6 volts very much either).

Last edited by 52Carl; 02/24/2025 2:04 AM.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission