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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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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