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...fundamentally, it's all about the "air" and it's maximum speed Mach index Z-number, so anything affecting "air" flow IN and OUT is a determinant.
...cam, timing, lift, valve dia, rate of lift, etc., intake & exhaust gas velocities through orifices (valves).
Last edited by gone-ot; 05-16-2011 at 10:22 PM..
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