I think there is some geometry different for the "major thrust" side.
For example, on the power stroke, there's a "ton" more load on the piston and so the direction it is travelling requires more thrust (supported by cylinder sidewall) support, and possibly a geometry change to the rod as well to encourage crank rotation in the normal direction.
New pistons that go into the latest 4-cylinder automotive engines have a completely different geometry from one side to the other in order to provide support where it is needed and take away drag where support is unneccessary.
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Today's Featured Article - Talk of the Town: How to Remove a Broken Bolt - by Staff. Another neat discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I have an aluminum steering gear housing with a bolt broken off in it. The bolt is about a 3/8" x 1 1/2" bolt. I've already drilled the center of the bolt out with about 7/64" drill bit the entire length of the bolt. Only one end of the bolt is visible. I tried to use an easy out but it wasn't budging and I didn't want t
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