I think the TFS cam is calculated at 1.6's for those lift numbers. You'll have to check the "@.050" lift on the cam card and then mulitply that by 1.7 to get the new lift. My buddy is running a TFS1 cam with TFS heads @ 1.6 with np. Very snappy cam too I might add! motor wraps up quick! Not sure about the GT-40's though. But it is always a good idea to clay...just to be sure.
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1990 Mustang GT Trick Flow heads,F303,Mac cold air,FMS 65mm tb,73mm ma,FMS 1.6,GT-40 intake,MSD igintion,NOS Big Shot@150,Mac equal shorties,Mac h-pipe,American Thunder flows,Centerforce dual friction,TTC 3550,alm drive shaft, 3.73's, HPM subframes, k-member brace, strut tower brace.. amongst others.
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