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The fx-55 will be quite a bit faster then the a64 4000+. the 4000+ is just a multi locked fx-53. the fx-55 runs at 2.6 comared to 2.4 for the fx-53 and the 4000+. The newer fx's seem to oc like made. one hit 3.6 on ln2 cooling a few weeks ago.
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2005 Mercury Grand Marquis. 230 WHP 249 ft-lbs as measured by a mustang dyno.
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