You can gain up to 38 more HP going from 1 3/4" to 2" in a semi-mild 440



I would be surprised to see that much gain.
I know CPPA had a test done years ago on a mild 440 and it was just as fast with the smaller 1-3/4 tubes as the 2" because it lost low end on the 2". To me the stronger engines will benifit more going with the larger tubes. I could be wrong but I didn't think it would make that much difference on a mild 440. Ron