Post seizure
 

Alright so here goes I bought a gz for 350 bucks and I knew the engine was seized. I had some luck with vehicles before and was overconfident going into this. Long story short I got it unseize or at least to the point where the Piston is moving halfway. I e when I have it in 5th gear walk it backwards with the clutch out then clutch in and hit the starter it moves the piston up into the head
but does not fully gain compression enough to attempts to turn over. I don't know if I'm being impatient and I should wait longer and continue to baby it and let it work loose or if you Pros had some thoughts.

Have a look into the spark plug hole with a flashlight or Bore camera. It is possible it dropped a valve.

Not sure the Piston moves well one way I might just have to suck it up and pull it off.