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Are you talking about my posts? All the information that I have given has come from my years studying automotive technology and mechanical engineering and being in the business for about 13 years now. I welcome anyone to challenge anything I write in my posts.
As far as rod length is concerned: Longer connecting rods will delay the point (in degrees after top dead center) that the piston reaches maximum velocity (when the crank throw is 90 degrees to the rod). Because this happens later you can have the valves open further by the time the piston is at maximum velocity and therefore essentially have the valves open further to create the least restriction in the intake tract and hopefully get a larger 'pull' of air/fuel.
Most modern engines would hopefully have the valves open to a lift where the ports won't flow any more air when the piston is at maximum velocity anyway but that is not always true on older engines.
Thanks,
Scott Tucker
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