The stock Coyote head flows more on the intake than Yates Ford Nascar head. Not a fair comparison exactly, since you're comparing two intake ports and valves to one, but it just shows you that they move a lot of air.
No one makes aftermarket heads for these engines yet. A few places will port them but there is a lot more room for making a mistake than there is for improvement. Jeff's heads have a Stage III porting job but I don't know who did them for TSM.
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