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i have not personally messed with alot of 4 cylinders but in my theory the 16 valve head would have alot more potential than the 20v. heres why; in my sweet little world it is a fact that 1 three inch pipe will flow mjore than 2 2 1/2 inch pipes and if you think about it a port is just a bent pipe and since you are adding more valves to the cylinder you must shrink the valve szie it will and the smaller valves will not flow asmuch aire as the big ones so to cmplete my rambleing 4 big valves will flow more than 5 smaller ones.
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