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NHRA Announces Parity changes for the E3 Spark Plugs Pro Mod Drag Racing Series Presented by J&A Services by J&A Service at the Dodge Mile-High NHRA Nationals Presented by Pennzoil.

In an effort to maintain parity the NHRA Technical Department will implement the following changes for the E3 Spark Plugs Pro Mod Drag Racing Series Presented by J&A Service at the Dodge Mile-High NHRA Nationals Presented by Pennzoil.  These changes will only be in effect during the Denver event.

  • Supercharger and ProCharger entries maximum (numeric) rear-end gear ratio 5.00 -to- one.
  • Roots Type Supercharger entries maximum supercharger overdrive limit is 20 percent.
  • Turbocharger entries maximum boost pressure limit 31 psi.

Additionally parity adjustments may be made to any combination prior to any event as a result of our normal post-race parity review.








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