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  1. 340 5.7 vs. 390 5.7

    V8's
    The current 5.7L in the new Dodge Ram 1500 has 390 (advertised) h.p., while my older 5.7L (in my 2006 Magnum) has 340 (advertised) h.p. 1. What are the differences? 2. Can our older 5.7s be modified (and how?) to add the 50 h.p.?
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