I put the 1.7's on a 1990 Lincoln Mark VII (5.0 HO, identical engine) at around 75K, and they were fine. I took them off again at around 100K before I sold the car, and had no problems the whole time. Car ran good and made plenty of power throughout the RPM range.
Maybe the Lincolns get superior valve springs?
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2002 GT
1993 GT (SOLD)
'93 Mustang GT
RHC member #142
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