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I would believe vortec flow numbers at .5 inch lift are not overly inspiring as far as raw numbers.
However, if you look at the entire flow of .05 lift through .5 (the area under the curve) the vortec heads do SOMETHING right because they give HUGE horsepower, huge torque, and great mileage.
Again. Vortec heads are the best all around streetable heads ever made for the 5.7, and they are arguably the best iron heads ever made for the 5.7.
They are the greatest thing ever until you see the 5.3/6.0 heads and look at the numbers of what they can do.
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