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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
The only brand of headers that I have seen is MAC with the 1 3/4" unequal length headers. What is the best brand to buy headers that are 1 3/4"? Its a 1990 5.0 LX
depends on the motor setup. a stock or near stock motor doenst need 1 3/4 and will actually hurt performance some...stick with 1 5/8s and i would go shorties for now......this is with thinking its still a smallCI motor thats near stock
if you had a larger motor like 347 with a lot of lift or a 351 and larger that was producing power above 400hp then i would step to to 1 3/4