MANLEY NexTek SERIES High Performance Valve Springs [Maximum Valve Lift .650 | O.D. 1.076 Top 1.311 Bottom | I.D. .650 Top .885 Bottom | Installed/Open Pressure 145 @ 1.811 370 @ 1.161 | Rate (lbs./in.) 353 | Coil Bind 1.100 | Weight (grams) 72] (CHRYSLER 5.7L & 6.1L HEMI) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS