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NHRA Technical Department Makes Performance Changes to the HOLLEY EFI Factory X Eliminator

Based on the Holley EFI Factory X performance numbers from the 2024 season the NHRA Technical Department is increasing the supercharger overdrive by changing the upper supercharger pulley for the 2019-2023 Chevrolet COPO from 3.375 inches to 3.250 inches. 2021 Dodge Drag Pak from 3.500 inches to 3.375 inches. 2019 Ford Cobra Jet from 3.500 inches to 3.375 inches aluminum block. 2019 Ford Cobra Jet from 3.750 inches to 3.625 inches iron block. The minimum weight for all combinations will be reduced from 2650 Lbs. to 2600 Lbs. The minimum weight on the rear axle will be reduced from 1300 Lbs. to 1250 Lbs. This rule change will go into effect immediately. NHRA reserves the right in the future to make additional rule changes to control performance and maintain parity in the category.