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They might work fine for what your doing then with that much motor. Sounds as if you might benefit from a little less torque and more HP. I read a report last year or year before in Mopar Muscle (I think) where they tested several different headers. The 1-5/8 did have more low end torque than...

From everything I've read 1-5/8 will do better for a small cube mill unless you are doing all out racing sao I agree with HawiiDuster.