Water went inside my intake manifold now engine is jammed?

Water escaped inside my intake manifold, on my 5.4L ford v8 while the car wasn't running. I removed the spark plugs and found a lot of water in some cylinders however it is not cranking even by the crank bolt with a breaker bar, if i empty the engine oil and change oil will that help?

Don't put too much pressure on the crank bolt. Instead, take the inspection cover off the trans &use a large screw driver on the flywheel teeth. Broken Crank bolt repairs are a nightmare. Now, how did the water get in there? Engine & plugs together all the time? Intake manifold on all the time? Air filter duct work on all the time? If so, You gotta take the heads off & fix the blown head gaskets ya have. Now, with the heads off, dry out the cylinders, put a teaspoon or so of motor oil in each one, coat the walls with oil, now try to spin the engine. Work it back & forth, both ways and she might free up.

Did you take all the spark plugs out? Or just a couple? It sounds like "hydrostatic lock". Water (liquid) doesn't compress. You can bend a rod or worse if you try to turn engine with water in cylinder with piston in compression stroke. Take all spark plugs out and try to turn engine with a breaker bar. If you haven't already caused damage it should rotate. If you do the screw driver on flywheel you will get too much leverage and distroy something. If engine does turn blow out any water with compressed air, through empty spark plug holes when each piston is at TDC.