'made a mistake that 1 yr later ' + 'The builder in question had already left the shop more than a year before the teardown.' + 'catastrophic enough to detonate the entire motor two years later.' = ??? First 2 quoted bits came from the OPost, made me think the builder left a present behind on his exit. But it could have been that he was gone before that engine got processed. I sought clarification. I read the article & found the third bit and see the issue is the OPoster's reading comprehension skillz. Can't be trusted.