The holes do help because there is no corner/notch for the crack to progress. A little off topic for cast iron but in school we were taught that the only holes that should go in a semi trailer frame (for a lowboy) have to be round. I have seen other shapes used but the corners always have a big radius rather than square. The holes make the trailer lighter and give more carrying capacity because of the reduced weight. Strange but true they basically make the trailer stronger. Same as a tubular beam can be stronger than a solid bar because the weight of the solid bar.
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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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