Firstly, area is always measured in square something (inches, feet, centimetres, etc.) so saying it flows 59mm is incorrect. Possibly you meant that an optimized t-body flows equal to an open tube of 59mm in ID. My optimized t-bodies have an open area of 4.0 square inches when the throttle plate is fully open.
Now I won't argue about how many per cent can be gained by a "super-duper" vs. a run-of-the-mill optimization. Personally, I optimize for both quantity and quality gains PLUS a proper seal. I've found that using countersunk screws DOES NOT promote good sealing as they tend to force the plate to one or the other side of the casting. I'd rather lose a small amount of flow area with button head screws and not have the plate jamming when closed (happened more than once).
So quality = efficiency......? What about flow at part throttle?
Redcoat Raceworks. Performance parts and custom fabricating for Contours, Mystiques and Cougars. Specializing in chassis and suspension parts. Custom end links, control arms, strut tower bars, engine torque braces, etc.
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