Here is an example, put your rpm in and recalculate. This assumes that your mph doesn't change.

RPM2 = RPM1 x 29.5/28
6321 = 6000 x 29.5/28

If your combo likes the change, it might improve mph maybe 0.5. If it runs out of breath, it could reduce mph by more than 2.0
If everything works, I think it should improve the sixty foot by maybe 0.03



Cool Jim, thanks for the formula

76' Volare, 5.9 magnum w/Iron heads. New best 10.68 at 123 mph 1/4 mile.