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Wise Auto Tools: As a Master Auto Technician in the repair industry for many years, I've always wondered "Why American cars and motorcycles used metric size spark plugs?" My research not only answers that question, it also provides some interesting history on two of the most popular spark plug brands, Champion and AC Delco. Read on to learn a little automotive history. The history of spark plugs in the United States is not only a tale of technological advancement but also a reflection of the ind …