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 Steel Valve Spring Retainer 41400423
Trick Flow Valve Spring Retainers Chromoly Steel 7 Deg 1.300" O.D .668" I.D
Trick Flow Racing Single Valve Spring 160-1577 Lot of 24 Stainless Steel Springs
(2) Trick Flow Valve Spring Retainers Chromoly Steel 7 Deg 1.250" O.D. .650"
Trick Flow Steel Valve Spring Retainer 21400415
Trick Flow Steel Valve Spring Retainer 52900424
