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The 13/14 refer to the "span" of the intensity. When cam designers are willing, they provide you with the major/minor/hydraulic intensity and then can further provide you with how the intensity is biased......i.e. if the opening is rougher than the closing, or the closing is rougher than the opening. That way you can determine how quickly the valve is opening, if it's getting slammed shut, if it's going to be a spring eater, etc. The spans will always add up to the intensity, so that way you can determine where the bias is. When dealing with hydraulic rollers, all of this information is extremely helpful, especially with heavier valvetrain engines like the FE.
