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If you think about the 153624 firing order, and the fact that it's a 4-stroke (two revolutions per spark), you'll see that an inline six is essentially two triples connected end-to-end (and not three twins connected end-to-end). This has ramifications when designing headers, or dual carb intake manifolds.
The question above, about Ford and GM calling different cylinders "number 1," is pertinent to Ford and GM V-8s, not inline sixes. Understandable confusion.
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