Don't know specifics on flow numbers, but I have the GT-40 cast iron heads. With intake, B cam, and the usual bolt ons, I am making the power in my sig.
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2006 Mustang GT
1990 LX
GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved)
1998 Contour SVT
Rice Haters Club Member #244
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