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How much horse power did a 67 fairlane 390 gt really have?
I have a 67 fairlane gt 390 4-speed. It is factory rated at 335, but i have heard that ford under rated
the hp for alot of its cars. Does any one know if this is true? And what my 390 would be?
posted: December 15, 2008
  Answers (3)
I've heard of a Fairlane GTA with a 390 engine punched out to about 425 horsepower. I don't know if this holds true for you, but any additional modifications to the engine would bring about even more horsepower if you want it to.
posted:  December 16, 2008
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a few ford engines were overated...but not the 390...335 is probably optimistic...
posted:  March 29, 2009
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Ford had hp ratings for the 390 that ranged from 250 to 401. The base 390 4v was 300, the police interceptor was 330 (solid lifters), 390 hp 4v was 375, 6v was 401, the Tbird with 6v was 340. I know the 390 GT's would hold their own against the 396 Chevelles up to 360hp. I would guess a 390 gt would be around 350 at the flywheel. I saw one on a chasis dyno, the owner said the engine had never been apart at it had around 65,000 miles on it and it made 280 hp at the wheels.
posted:  May 17, 2013
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