motor wont turn over?

I don't think you guys undestand the problem, I am not trying to start the engine, It's not a firing problem or fuel. The starter is not bad and the motor will turn over very fast with the plugs out. the pistons are not hitting the plugs. Like I said the motor will turn over great as long as the plugs are not in it. The only thing that I can think is that the timing chain is not on right and the exhaust valves are not opening whe the piston comes back up or the exhaust stroke, does this sound possible?