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Never having experienced a 400 hp motor with a chink that close to the top ring, I don't know for sure, but I wouldn't think anything good would come of it. The ones I slapped together had rust craters farther down in the bore. Maybe fire punching around the top ring at TDC could burn it larger or maybe through to the water jacket. I'm just guessing, I don't know. Maybe one of the more experienced builders who has encountered this sort of problem will weigh in with an intelligent answer.
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