Motor problem

[wade w]

I got this other lightning to work on. It just cut off on the guy driving normal on the way home. They told me it sounds like it has no compression when they turn it over. The rocker arms can be taken out if the cam is on the base circle. The cam isnt even touching the rocker. I was also told it was really low on oil. Would you think it lost oil presure and pumped the rocker stands down that bad? I turned it over by hand with one of the valve covers off. It did open one of the valves. I only turned it over enough to see if it would open that one valve.