Stroelman did measure the tooth spacing, indicating that his flywheel is for a 6V starter with 139 teeth. I was the one that provided the 9-tooth dimension for the tech tip and counted all the teeth on the flywheel I measured. And if his starter is actually a 12V, then it's mismatched with his flywheel. It may have worked until now, but will eventually damage either the starter or the flywheel.
The starter mounting for 6 cylinder engines would be the same at least from 1947 thru 1958. I had a 1958 235 that had a 47-53 bell housing, 139 tooth flywheel, and 6V starter which I think someone was going to install in a 1937 pickup.
