Quote:
Originally posted by JDMFantasy2k
3 valve head? aren't the heads found on the cobra and mach 1 4 valve heads? so, why not use those...
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Hard to say. My guess is cost. The Mach 1 and Cobra heads are DOHC while the 3 valve is SOHC. Less sophisticated = less expensive. That...and a few trucks were already using the 3 valve heads. The '07 GT500 will have 4 valve heads, but it'll be on a 5.4L and the heads will be sourced from the Ford GT.
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