WE used to leave in the 6 volt starter. or find an 6 volt to put in. You have to keep it tuned so it will start first crank over. I had a 11 1/ 2 to one 352 ford, 3= 2's Isky , headers. It would start at 20 below zero. or when the engine was wet from steam cleaning it in college auto shop. If you crank it more than 30 seconds you will fry the starter. If it doesn't start wait 4 or 5 minutes to let the starter cool down.