Guy's there is just no good reason for an engine to be so tight that you can't turn it
If the spark plugs are our and it's been lubed you should be able to turn it.
If it takes a wrench that is much longer than the flywheel radius your gonna have at best an engine that doesn't run as long as it should.
Your engine builder should be cranking the engine as he or she assembles it
I had a gen drive bush tighten-up on an old engine
I was building once.If I'd not been moving the parts as I put them in it would have taken some time to find the problem
