Rebuilt 340 really difficult to turn over
If you're having problems getting your car to turn over, here's what you do:
Get your car out on the highway and drive between 70 - 90 MPH. Then slam on the brakes and turn the wheel all the way to one side. Your car will turn over, no problem....
LOL!
Seriously, I also use motor honey when I build an engine. If no motor honey available, then STP.