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NHRA Technical Department Makes Parity Adjustment Changes to the Constant Aviation NHRA Factory Stock Showdown

Based on the Constant Aviation NHRA Factory Stock Showdown performance numbers from the first 5 races of the 2022 season, the NHRA Technical Department is reducing the 2019 Cobra Jet 327 supercharger overdrive by changing the upper supercharger pulley from 3.625 inches to 3.750 inches  These rule changes 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.






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