MANLEY NexTek SERIES High Performance Valve Springs [Maximum Valve Lift .525 | O.D. 1.016 Top 1.126 Bottom | I.D. .640 Top .750 Bottom | Installed/Open Pressure 95 @ 1.420 270 @ .895 | Rate (lbs./in.) 330 | Coil Bind .860 | Weight (grams) 45] (FORD 4.6L & 5.4L 4V MOD) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS