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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
Which cam? Generally Gt-40 head/intake setup alone will put you around 200-210 rwhp, a cam can add up to another 20 depending on how aggressive you go.
Also, keep in mind, my numbers may be a little understated as people tend to have varied results with GT-40 parts as there are several variations of GT-40 intakes and heads, I'm talking GT-40 Cobra intake w/ GT-40 Cobra iron heads.
stock gt40 heads, as in the GT40P cast heads off an Explorer/Mountaineer or GT40X aluminum heads?? i would guess with a manifold, heads and a b(more duration) or e(more lift) cam probably 260-270hp(at the flywheel). i may be wrong though so dont hold me to those numbers