Re: hard cranking flathead
Like the others have said, it should be free to turn by hand with a 1/2 breaker bar. If it's not, you have a problem that towing or high voltage won't fix. Even if you got it running, you're probably going to cook something.
On assembly the engine should be rotated by hand after each component is installed/torqued. I did a job where the main caps were swapped. As soon as I torqued the cap the crank got bound up.
The opposite is true when trying to diagnose the problem. Each cap should be loosened and the engine rotated to find where the binding is.
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