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IndyCar: Series open to allowing production-based engines | RACER
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Indycar officially allows lotus engine modifications
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RACING NEWS - December 2019 Racing - IndyCar, Formula 1, Indy Lights
Chevy & Honda, not Ferrari, commit to next generation IndyCar engine
INDYCAR Officially Allows Lotus Engine Modifications
IndyCar: Series open to allowing production-based engines | RACER
Honda celebrates 2018 manufacturer championship
IndyCar: Revised, more powerful engines on tap in 2014 | RACER