You know it's probably cheaper to just find yourself a set of aftermarket trick flow heads to put on your motor. Or go find an early 351c short block somewhere. Why don't you just sell the 4v cleveland heads and pay for the machine work to put larger valves in your heads you have now. I've got 2 sets of 4v cleveland heads and it's way cheaper to just modify my Windsor heads or even buy some already assembled heads for racing. You know you can get good money for even bare 4v cleveland heads (the 2.25 heads).
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