Check out this thread... I think that it is narrowing down between the TFS and AFR heads...
http://forums.mustangworks.com/showt...threadid=17357
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-1991 LX 5.0 Sedan, 5 spd (new 'Z' tranny), 3.73, aluminum DS, Hedman headers, 190 LPH, MAC CAI, Flowmaster catback. (170K miles on motor)
Best ET: 14.434 @ 96.04 MPH - 2.205 60' (Radials)
My Notch
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