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Why are there two different I-6 motors listed
for the f-series trucks? I was looking at some info on the 1991 f-150 and it listed 150HP and 145 HP under engines.....anybody know why? Is one for towing? Maybe more torque?
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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