Hardcore gearheads are well-versed in engine nomenclature, but for folks whose car knowledge ends with the difference between a manual and automatic transmission, engine designations can seem inscrutable. At a fundamental level, most engines are labeled with a ‘V’ or an ‘I’ and an even number from 4 to 12. The number tells you how many cylinders an engine has, and the letter indicates how they are arranged.  ‘I’ — or straight — engines have their cylinders arranged in
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