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I would expect any rebuilder to get away with as little cost as possible when rebuilding engines, anything that is reuseable adds to profit but can cause problems later if out of spec. The key to making money and having no service problems is experience in knowing what to get away with and has a lot to do with the application. At least a new one should be within specs. I tend to do thing way different than the average builder but have always purpose built engines for a specific app. Getting feedback over years and miles helps a lot.