seized 01 gt
 

Attachment 57148

What would cause that?
+ the engine is seized don't know why yet haven't had time to take it out of the car. I have the valve covers off and its ready to be pulled out. Cams look good and the timing chain is tight and in good shape. So Idk why it just seized up and stopped running.

Attachment 57146

Attachment 57147

Cams

Also a while back I opened my oil pan up, couldn't get it all the way off. But I put my phone in and took a video and everything looked good but I could only see the back two pistons drivers side two and the passengers side two. Couldn't get to the front pistons. They all looked good from what I could see.
What else could be making it not crank manually?

For a plug to be physically damaged like that either the piston hit it or there is some kind of debris in the cylinder. That evidence combined with the fact u can't turn the motor, well its shot. Only option is to tear it down.

Don't know what did that to your plug but from looking at the pictures it look like they are NPI heads which didn't come on 01's has the motor been swapped?

I don't think it has been swapped. But that same plug once blew out of the head and I had to get it rethreaded. Got it rethreaded couple of years back. About 4-5 years back.
Whats the difference from pi and npi?

Those are pi heads. I was just looking at pics of pi and npi
Npi are more circular and pi are more rectangular mine are rectangular. The intake holes is what I'm talking about.

&I doubt this engine has been swapped I got it in 06 and the car is an 01 so why would anyone swap it and its 5 years old.

But the engine only had a little over 110k miles and just stopped. Crank doesn't move or anything. Everything was well kept.

+1 im guessing the same piece that broke your spark plug, or the spark plug remnants are holding open one of the valves causing the piston to hit it...

I would start by looking at those valves, either way time to remove heads and check for damage

But that wouldn't stop the crank from moving will it? I can't move it at all with a breaker bar and all the plugs removed.

as stated there is probly something ( remnants of the plug ) stuck in the valve holding it open it will stop the crank from spinning if the piston is contacting the valve and cant reach its full stroke.