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Well it is true both are great engine's and the 8.3 does get better mpg and faster in long run, that bog taking off from dead stop sickens me so bad l won't own another. Plus I already have a 350 big cam that should solve any problem.

I guess there's only one way to settle this, we need to hook chain's. Somebody got to have this on video.

The 8.3 does have higher torque but only in a narrow power band.

Well I'd trade my m931a2 for another a1. 855s powered 80000# semi's 8.3 power's school buses.