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The NASCAR engine rule that forced Chrysler to abandon the 426 Hemi

The 426 Hemi became one of the most dominant engines in NASCAR history, but its success eventually led to stricter rules that ...
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FIA clamps down on F1 engines as hot-temperature test rule sparks Mercedes row

Formula 1’s governing body, the FIA, is preparing to tighten scrutiny of engine compliance starting in June 2026, with new checks focusing on how power units behave once they reach full operating ...