Coolant leak -hydro locked engine

Would you mind telling us who did it? You might save someone the trouble of making the same mistake.

Glad you figured it all out and that at least your pistons can be reused. You'll get it back going again. You're right on the piston clearance if those are forged. That is a bit too tight, IMO. I like to see forged pistons approaching .005". I know some will scoff at that, but I like a loose engine.