Bill Skillman and Tripp Carter at NMCA World Street Finals

[onefarmer]

Originally Posted by Superfan1

The NHRA has changed the size of the upper pulley on the supercharger of the Cobra Jets numerous times in an effort to slow them down supposedly to maintain parity in the Showdown. That is why the Cobra Jets are significantly quicker and faster at an NMCA race.

Its been two years since Mustangs were hit with a pully change. The only difference right now on all three brands is that Chevy is allowed to change from 6% under drive pully in NHRA to 6% over drive in NMCA. Dodge and Ford run same combo in both sanctions.