The only offset I recall analyzing in labs at GMI was wrist pin offset. This was done to reduce cylinder wall wear more than anything. The cylinder bores were always on the main bearing centerline of the crankshaft though.
One interesting finding during development of the 301 was confirmation that the combustion forces on the main bearing cap were always higher than the balancing load needed to offset rotational forces. That justified removing the crankshaft counterweights on that engine in an effort for better fuel economy.
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