All aluminum pistons are "cam" ground, meaning egg shaped. Being smaller across on pin side than thrust side. Also, tapered from bottom to top on thrust sides of piston. You measure just below the bottom ring groove on the skirt, and bottom of skirt to determine how much taper. Usually about .002 to .003 depending on size of piston. The ring lands them selves will be much less diameter and probably vary from one ring land to the next. Reminds me of a point one of IH super salesman brought up at a meeting many years ago. He was pointing out that IH pistons were cam ground ( which he had never heard of before and didn't know what it meant). He was using this as a selling point over the competitors. I told him we cam ground pistons in 1955 at school on any and all aluminum pistons. Then another time when a John Deere mechanic was pointing out to me that the new Deere diesels used a keystone (tapered ring land) and I tried to convince him IH and other mfg's had been using it for several years. Most mfg's use very similar style pistons and rings.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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