Quote:
Originally Posted by dirtyd88
Ford has never put a 3.8 in a F150...unless yo uare talking about taking heads from a V6 mustang and putting them on the 4.2.... 
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The only real difference between a 3.8L and 4.2L of the same vintage is the crank and some bore.
They are the same engine for the most part. Even the heads, I bet.