TFS spring upgrade kit works w stock or trick flow heads 4.6 liter heads up to a .600 lift the kit is complete w everything u need to upgrade your heads,for both side right and left.
Trick Flow TFS-2500100, Kit Valve Spring Upgrade Kit Fits Ford 289-351W Performa
Trick Flow Valve Spring Cups 1.175" Spring Dia .280" Cup Thickness Steel SetOf8
Gaskets-Trick Flow Stree tBurner/Track Heat manif TRICK FLOW TFS-51522007-4
Trick Flow Valve Spring Cup 51400434
Trick Flow Valve Spring Cup 31400433
