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Pushrod boost at Indianapolis
A concession written to keep older pushrod engines competitive was read literally in 1994 and answered with a purpose-built engine that used all of it.
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Six wheels
Nothing in the wording said four, so somebody built six — and the rules were rewritten afterwards to say four.
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Movable devices
Aerodynamic devices must be fixed and immobile, a sentence that has been argued over continuously since it was written.
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