I agree with Walt, if you need to ream the ridge it's time for a bore job. The ridge is the part of the cylinder that is still original, it's the rest of the cylinder that's wore. 0.020 on each side is a lot. You may break the pistons trying to get them out when the rings hang up on the ridge. If the cylinder is wore that much at the top it's most likely wore bell shaped, which means more in the middle or bottom and the rings can't expand and contract that fast in each stroke to compensate and seal. So if you only remove the ridge your engine will most likely still burn oil and smoke. The wear can also be caused by over-heating, I would remove the block and get it boiled out it may be full of debris or rust.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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