Hello I have a 1954 chevy 3100 the 1954 had a 6 volt flywheel I think 1955 chevy went to a 12 volt flywheel the number of teeth on the flywheel determine if it is a 6volt or a 12 volt flywheel. Both starters have the same number of teeth . A true 12 volt conversion the flywheel needs changed to match the starter gear. Sure you can put a 12 volt starter on with a 6 volt flywheel yes it mite work for a while but sometime it will engage sometime it won't! It will make a grinding noise. But you can put a 6volt gear on a 12volt starter.The bottom line is how many teeth does your flywheel have on it Been there done that !!!!!! Chambers auto elect in Mississippi a great starter GUY!!!!
