If it has stuck valves, take the valve cover off, look for the stuck ones, that will be open and not moving.
Spray some penetrating oil between the spring coils onto the stem, above the guide, let it soak if possible.
Then try lightly tapping down on the spring retainer, sometimes that will shock it loose.
If that doesn't work, try prying between the spring coils to force it closed. Then try prying it open to free it. Just be careful not to bend the stem or release the keepers.
Also check for bent pushrods.
And do give each cylinder a squirt of oil to lube the rings.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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