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With the rough cuts done, Steve then stress-relieved the block. "This is a critical step that most shops do not do, or know about, for that matter. No stress relief and the block will distort in service, leaving bores that are four to five thousandths out of round. The same is true (but to a lesser extent) with the dry-liner installs. In any event, I have a Formula 62 stress relief machine which relieves the block at its natural resonant frequency. As far as I am concerned, this is the best stress relief machine on the market and is used by thousands of high-tech companies including Boeing and GM. I leave the block on the machine for an hour to reduce internal stresses from machining to a minimum," said Steve.