1963-76 Ford Mercury 352 390 428 RV Torque Cam Lifter Kit lifters E966P Elgin (Torque Cam) Duration (INT/EXH): 254 / 264 Duration @ .050" (INT/EXH): 204 / 214 Valve Lift (INT/EXH): .484 / .510 Lobe Centerline: 112 Power Range: 1200-4700