What COP's?
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Actually, 2004 was the first year of 3v heads, but that is in the new style trucks. However, 2004 also had the older style "Heritage" that had the 2v still. The 4v was a Navigator engine, as well as the mustang cobra's, mach 1's, Mercury Marauder etc. In any case, just tell us the year and you'll be set.
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