Quote:
Originally Posted by 03Mach150BP
Can someone give me the short and sweet differences between:
03/04 Mach1 Heads
03/04 Cobra Heads
FR500 4.6L Heads
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There is no difference between the Mach and Cobra heads that you listed. The FR500 heads flow better(some think the 03/04 heads flow just as good), and benifit by changing the cam's, valves, and springs.