What is your reason for converting the car? If it's strictly because of slow cranking, I have an alternative for you that will save you some time and money. I can supply high torque windings for the existing 6 volt starter. I've rebuilt many starters for customers using new high torque windings and they are always very surprised and pleased with the results.
FYI, You can in fact run your existing starter on 12 volts including the solenoid. And, yes it is quite hard on the starter running it as is. They crank like mad and it takes it's toll on the starter and the drive/bendix. It's not like it will blow up right away, but it's life will be shortened for certain. I can always tell when I get a 6 volt starter in and it's been run on 12 volts.
Feel free to contact me with any questions. I'd be happy to help.
Jason
Advanced Electrical Rebuilders
jason@aerrebuild.com www.aerrebuild.com
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