I suspect the information in the "Related Question" below is equally applicable to the 1989, but... you can double check the torque specifications at a place like Autozone.com and their free online Repair Guide.
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You can get the full engine specs on the Ford Website. Here is the link for the 2011 Ford Taurus: http://www.fordvehicles.com/cars/taurus/specifications/engine/
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Torque specs for what part of the engine? There is torque specs for everybolt under the hood, some don't need to be used but some are critical
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