7.3 replaced injectors now wont turn over
I have a 2001 f-250 with a 7.3 with 189000 miles Had a check engine light did a buzz test and injector 7 was bad. Went to ford and got the injector and replaced it as well as installed new rings on the other 7 injectors. I had to pull the front rocker on 8 because i just couldn't get the injector out. When I put it all back together I mad sure the push rod seated. Seamed like the rocker was pushing the spring a touch more than the other valves looked. Turned it over it turned over maybe 4 time and then a sound like taking a hammer to a I-beam. I tried to turn the crank manually and cant get it past 8 either way I turn it. Been told maybe bad valve or hydro locked any ideas? I am going to take out the glow plug on 8 this morning and see if it passes threw when I manually turn the crank. Any ideas would be great full.