Well, with zero compression, my opinion is that the valves are hanging. Unless each piston has a hole in it. even sticky rings will provide a little compression.
So, check your valves to see if they have full travel and are closing all the way. Use a small brass hammer or similar. On each valve that has a loose push rod (ie. valve is closed), tap the valve and see if it moves. It should "snap" back with a distinct sound as it seats. If the valves don't snap back or make a sound when seating, you have valve issues. Could be corroded stems or rusted seats. Either will not seat and seal.
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