As much as it pains me to tell you, they were actually OVER-RATED by todays standards. In the September issue of Mustang Monthly, they dyno tested an example of all the big blocks, with an exception of the 427. The Cobra Jet put out 237hp and 337ft/lbs of torque. This was from a refurbished 428, so it wasn't tired, and according to the article the tune was right on. The new 4.6 put out 244hp. Don't feel too bad though, my beloved S-Code only put out 165hp.
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