I had the same problem on my 216 engine, battery, starter were good. I noticed that the starter bendix was not engaging the flywheel, turned the flywheel until everything lined up and its worked fine since.

Good Luck

Charlie

1953 5 Window
1994 Harley, Heritage Softail Classic
2006 Chevy Colarado
I didn't say it was your fault, I said I was blaming you.