How to test 5.7 hemi?

Well I got some bad news. I pulled all plugs, pulled valve covers.
Went to manually spin engine with a breaker bar, and it will not turn. Not one freaking bit.
Now mind u, when I bought it, it did turn. So either the guy some how set me up and did something to let it turn at time of purchase , or somehow something has changed.

I had it sitting in bay, no go.
Lifted it up on cherry picker, was trying to turn so hard I started to flip engine over on itself on the chains.

Guess its a tear down now.